[clang-format] [NFC] add recent changes to release notes

[MyDeveloperDay]

Summary

clang-tidy keeps nice release notes of what is added, have clang-format do the same.

[MyDeveloperDay]

@Eugene.Zelenko I've noticed you are always giving excellent review feedback in clang-tidy especially around the documentation, I'd appreciate your eyes on finding the right level of documentation here.

[merge_guards_bot]

Build result: pass - 60143 tests passed, 0 failed and 729 were skipped.
Log files: console-log.txt, CMakeCache.txt

[Eugene.Zelenko]

General comments:

• Isn't Option(s) ... was/were added or Option(s) ... had been added are more correct from from point of view of English grammar? Same for older entries.
• It'll be great to nag developers to expand Release Notes when relevant code changes are made.

clang/docs/ReleaseNotes.rst

322

and between Options and DeriveLineEnding are not necessary.

323

I would suggest to use dot after newlines.

325

UseCRLF should be enclosed in double back-ticks.

328

to insert?

[MyDeveloperDay]

Address review comments
Remove excessive newlines
Remove trailing whitespace

[mitchell-stellar]

LGTM

clang/docs/ReleaseNotes.rst

- Option *IncludeIsMainSourceRegex* added to allow for additional
   For example, if this option is configured to ``(Impl\.hpp)$``,
   then a file ``ClassImpl.hpp`` is considered "main" (in addition to
   ``Class.c``, ``Class.cc``, ``Class.cpp`` and so on) and "main
   include file" logic will be executed (with *IncludeIsMainRegex* setting
   also being respected in later phase). Without this option set,
   ``ClassImpl.hpp`` would not have the main include file put on top
   before any other include.
 
+- Options and ``DeriveLineEnding`` and  ``UseCRLF`` added to allow 
+  clang-format to control the newlines, ``DeriveLineEnding`` is by default 
+  ``true`` and reflects is the existing mechanism, which based is on majority
+  rule. The new options allows this to be turned off and UseCRLF to control 
+  the decision as to which sort of line ending to use.
+
+- Option ``SpaceBeforeSquareBrackets`` added to allow for a space before
+  array declarations.
+
+  .. code-block:: c++
+
+    int a [5];    vs    int a[5];
+
+
+- Clang-format now supports JavaScript null operators.
+
+  .. code-block:: c++
+
+    const x = foo ?? default;
+    const z = foo?.bar?.baz;
+
+
 libclang
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 - ...
 
 
 Static Analyzer
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