[clang-format] Update style documentation, NFC

[krasimir]

Summary

Style documentation is generated automatically by docs/tools/dump_format_style.py. This hasn't been ran for a while.

[krasimir]

• Update style options comments

docs/ClangFormatStyleOptions.rst

**AllowShortFunctionsOnASingleLine** (``ShortFunctionStyle``)
   Dependent on the value, ``int f() { return 0; }`` can be put on a
   single line.
 
   Possible values:
 
   * ``SFS_None`` (in configuration: ``None``)
     Never merge functions into a single line.
 
+  * ``SFS_InlineOnly`` (in configuration: ``InlineOnly``)
+    Only merge functions defined inside a class. Same as "inline",
+    except it does not implies "empty": i.e. top level empty functions
+    are not merged either.
+
+    .. code-block:: c++
+
+      class Foo {
+        void f() { foo(); }
+      };
+      void f() {
+        foo();
+      }
+      void f() {
+      }
+
   * ``SFS_Empty`` (in configuration: ``Empty``)
     Only merge empty functions.
 
     .. code-block:: c++
 
-      void f() { bar(); }
+      void f() {}
       void f2() {
         bar2();
       }
 
   * ``SFS_Inline`` (in configuration: ``Inline``)
     Only merge functions defined inside a class. Implies "empty".
 
     .. code-block:: c++
 
       class Foo {
         void f() { foo(); }
       };
+      void f() {
+        foo();
+      }
+      void f() {}
 
   * ``SFS_All`` (in configuration: ``All``)
     Merge all functions fitting on a single line.
 
     .. code-block:: c++
 
       class Foo {
         void f() { foo(); }
**BraceWrapping** (``BraceWrappingFlags``)
   Nested configuration flags:
 
 
   * ``bool AfterClass`` Wrap class definitions.
 
   .. code-block:: c++
 
     true:
-    class foo
-    {};
+    class foo {};
 
     false:
-    class foo {};
+    class foo
+    {};
 
   * ``bool AfterControlStatement`` Wrap control statements (``if``/``for``/``while``/``switch``/..).
 
   .. code-block:: c++
 
     true:
     if (foo())
     {
**BraceWrapping** (``BraceWrappingFlags``)
   * ``bool AfterStruct`` Wrap struct definitions.
 
   .. code-block:: c++
 
     true:
     struct foo
     {
       int x;
-    };
+    }
 
     false:
     struct foo {
       int x;
-    };
+    }
 
   * ``bool AfterUnion`` Wrap union definitions.
 
   .. code-block:: c++
 
     true:
     union foo
     {
.. code-block:: c++
 
     false:
     if (foo()) {
     } else {
     }
 
   * ``bool IndentBraces`` Indent the wrapped braces themselves.
 
+  * ``bool SplitEmptyFunctionBody`` If ``false``, empty function body can be put on a single line.
+  This option is used only if the opening brace of the function has
+  already been wrapped, i.e. the `AfterFunction` brace wrapping mode is
+  set, and the function could/should not be put on a single line (as per
+  `AllowShortFunctionsOnASingleLine` and constructor formatting options).
+
+  .. code-block:: c++
+
+    int f()   vs.   inf f()
+    {}              {
+                    }
+
 
 **BreakAfterJavaFieldAnnotations** (``bool``)
   Break after each annotation on a field in Java files.
 
   .. code-block:: java
 
      true:                                  false:
      @Partial                       vs.     @Partial @Mock DataLoad loader;
**BreakBeforeTernaryOperators** (``bool``)
 
   .. code-block:: c++
 
      true:
      veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongDescription
          ? firstValue
          : SecondValueVeryVeryVeryVeryLong;
 
-     false:
+     true:
      veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongDescription ?
          firstValue :
          SecondValueVeryVeryVeryVeryLong;
 
-**BreakConstructorInitializersBeforeComma** (``bool``)
-  Always break constructor initializers before commas and align
+**BreakConstructorInitializers** (``BreakConstructorInitializersStyle``)
+  The constructor initializers style to use..
+
+  Possible values:
+
+  * ``BCIS_BeforeColon`` (in configuration: ``BeforeColon``)
+    Break constructor initializers before the colon and after the commas.
+
+    .. code-block:: c++
+
+    Constructor()
+        : initializer1(),
+          initializer2()
+
+  * ``BCIS_BeforeComma`` (in configuration: ``BeforeComma``)
+    Break constructor initializers before the colon and commas, and align
     the commas with the colon.
 
     .. code-block:: c++
 
-     true:                                  false:
-     SomeClass::Constructor()       vs.     SomeClass::Constructor() : a(a),
-         : a(a)                                                   b(b),
-         , b(b)                                                   c(c) {}
-         , c(c) {}
+    Constructor()
+        : initializer1()
+        , initializer2()
+
+  * ``BCIS_AfterColon`` (in configuration: ``AfterColon``)
+    Break constructor initializers after the colon and commas.
+
+    .. code-block:: c++
+
+    Constructor() :
+        initializer1(),
+        initializer2()
+
+
 
 **BreakStringLiterals** (``bool``)
   Allow breaking string literals when formatting.
 
 **ColumnLimit** (``unsigned``)
   The column limit.
 
   A column limit of ``0`` means that there is no column limit. In this case,
   clang-format will respect the input's line breaking decisions within
   statements unless they contradict other rules.
 
 **CommentPragmas** (``std::string``)
   A regular expression that describes comments with special meaning,
   which should not be split into lines or otherwise changed.
 
   .. code-block:: c++
 
      // CommentPragmas: '^ FOOBAR pragma:'
      // Will leave the following line unaffected
      #include <vector> // FOOBAR pragma: keep
 
+**CompactNamespaces** (``bool``)
+  If ``true``, consecutive namespace declarations will be on the same
+  line. If ``false``, each namespace is declared on a new line.
+
+  .. code-block:: c++
+
+    true:
+    namespace Foo { namespace Bar {
+    }}
+
+    false:
+    namespace Foo {
+    namespace Bar {
+    }
+    }
+
+  If it does not fit on a single line, the overflowing namespaces get
+  wrapped:
+
+  .. code-block:: c++
+
+    namespace Foo { namespace Bar {
+    namespace Extra {
+    }}}
+
 **ConstructorInitializerAllOnOneLineOrOnePerLine** (``bool``)
   If the constructor initializers don't fit on a line, put each
   initializer on its own line.
 
   .. code-block:: c++
 
     true:
     SomeClass::Constructor()

 **ObjCSpaceAfterProperty** (``bool``)
   Add a space after ``@property`` in Objective-C, i.e. use
   ``@property (readonly)`` instead of ``@property(readonly)``.
 
 **ObjCSpaceBeforeProtocolList** (``bool``)
   Add a space in front of an Objective-C protocol list, i.e. use
   ``Foo <Protocol>`` instead of ``Foo<Protocol>``.
 
+**PenaltyBreakAssignment** (``unsigned``)
+  The penalty for breaking around an assignment operator.
+
 **PenaltyBreakBeforeFirstCallParameter** (``unsigned``)
   The penalty for breaking a function call after ``call(``.
 
 **PenaltyBreakComment** (``unsigned``)
   The penalty for each line break introduced inside a comment.
 
 **PenaltyBreakFirstLessLess** (``unsigned``)
   The penalty for breaking before the first ``<<``.

include/clang/Format/Format.h

struct FormatStyle {
   ///    true:
   ///    veryVeryVeryVeryVeryVeryVeryVeryVeryVeryVeryLongDescription ?
   ///        firstValue :
   ///        SecondValueVeryVeryVeryVeryLong;
   /// \endcode
   bool BreakBeforeTernaryOperators;
 
   /// \brief Different ways to break initializers.
-  enum BreakConstructorInitializersStyle
-  {
+  enum BreakConstructorInitializersStyle {
     /// Break constructor initializers before the colon and after the commas.
     /// \code
     /// Constructor()
     ///     : initializer1(),
     ///       initializer2()
     /// \endcode
     BCIS_BeforeColon,
     /// Break constructor initializers before the colon and commas, and align