[clang-tidy] Fix documentation of misc-suspicious-missing-comma

[etienneb]

Summary

The clang-tidy documentation generation was broken since commit : http://reviews.llvm.org/D18457

I ran locally the documentation generation and I fixed errors related to that specific check.

[alexfh]

LG

docs/clang-tidy/checks/misc-suspicious-missing-comma.rst

 (after the preprocessor). This feature is used to represent long string
 literal on multiple lines.
 
-For instance, these declarations are equivalent:
+For instance, the following declarations are equivalent:
+
+.. code:: c++
+
   const char* A[] = "This is a test";
-  const char* B[] = "This" " is a "
-                    "test";
+  const char* B[] = "This" " is a "    "test";
 
+
 A common mistake done by programmers is to forget a comma between two string
 literals in an array initializer list.
 
+.. code:: c++
+
   const char* Test[] = {
     "line 1",
     "line 2"     // Missing comma!

     "line 5"
   };
 
+
 The array contains the string "line 2line3" at offset 1 (i.e. Test[1]). Clang
 won't generate warnings at compile time.
 
 This checker may warn incorrectly on cases like:
 
+.. code:: c++
+
   const char* SupportedFormat[] = {
     "Error %s",
     "Code " PRIu64,   // May warn here.
     "Warning %s",
   };
+