Fix unclosed parentheses in peekNextToken's comment

Signed-off-by: yronglin <[email protected]>

Author: yronglin

clang/include/clang/Lex/TokenLexer.h

@@ -139,8 +139,8 @@ class TokenLexer {
   void Init(const Token *TokArray, unsigned NumToks, bool DisableMacroExpansion,
             bool OwnsTokens, bool IsReinject);
 
-  /// If TokenLexer::isAtEnd returns true (the next token lexed will pop this
-  /// macro off the expansion stack, return std::nullopt, otherwise return the
+  /// If TokenLexer::isAtEnd returns true(the next token lexed will pop this
+  /// macro off the expansion stack), return std::nullopt, otherwise return the
   /// next unexpanded token.
   std::optional<Token> peekNextPPToken() const;