Fix typo: charater → character

lib/Parse/Parser.cpp

@@ -332,7 +332,7 @@ SourceLoc Parser::consumeStartingCharacterOfCurrentToken() {
     return consumeToken();
   }
 
-  // ... or a multi-charater token with the first character being the one that
+  // ... or a multi-character token with the first character being the one that
   // we want to consume as a separate token.
   restoreParserPosition(getParserPositionAfterFirstCharacter(Tok));
   return PreviousLoc;