Documentation cleanup: Use \brief for summaries, and escape # characters.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158619 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Lex/PreprocessorLexer.cpp

@@ -27,7 +27,7 @@ PreprocessorLexer::PreprocessorLexer(Preprocessor *pp, FileID fid)
     InitialNumSLocEntries = pp->getSourceManager().local_sloc_entry_size();
 }
 
-/// LexIncludeFilename - After the preprocessor has parsed a #include, lex and
+/// \brief After the preprocessor has parsed a \#include, lex and
 /// (potentially) macro expand the filename.
 void PreprocessorLexer::LexIncludeFilename(Token &FilenameTok) {
   assert(ParsingPreprocessorDirective &&