[clang][NFC] Remove stray slash

Author: tbaederr

clang/lib/Lex/Lexer.cpp

@@ -2602,7 +2602,7 @@ bool Lexer::SkipLineComment(Token &Result, const char *CurPtr,
   // \r\n sequence.  This is an efficiency hack (because we know the \n can't
   // contribute to another token), it isn't needed for correctness.  Note that
   // this is ok even in KeepWhitespaceMode, because we would have returned the
-  /// comment above in that mode.
+  // comment above in that mode.
   NewLinePtr = CurPtr++;
 
   // The next returned token is at the start of the line.