C++: added some notes regarding QTCREATORBUG-7968

Change-Id: Ia7a0e4b416ba6ef768d76595d8576262a828ae78
Reviewed-by: David Schulz <david.schulz@digia.com>

src/libs/3rdparty/cplusplus/Parser.cpp

@@ -6296,6 +6296,8 @@ bool Parser::parseLambdaCapture(LambdaCaptureAST *&node)
 
 bool Parser::parseCapture(CaptureAST *&)
 {
+    // See QTCREATORBUG-7968
+
     DEBUG_THIS_RULE();
     if (LA() == T_IDENTIFIER) {
         consumeToken();