fix comments a bit

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172146 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 6276a18..b8c6f50 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -374,8 +374,8 @@
   void initializeDirectiveKindMapping();
 };
 
-/// \brief Generic implementations of directive handling, etc. which is shared
-/// (or the default, at least) for all assembler parser.
+/// \brief Generic implementation of directive handling, etc. which is shared
+/// (or the default, at least) for all assembler parsers.
 class GenericAsmParser : public MCAsmParserExtension {
   template<bool (GenericAsmParser::*Handler)(StringRef, SMLoc)>
   void AddDirectiveHandler(StringRef Directive) {