Update Lib/test/test_syntax.py

Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>

Author: Aniketsy

Lib/test/test_syntax.py

@@ -3508,7 +3508,7 @@ def test_ifexp_body_stmt_else_stmt(self):
     def test_double_ampersand(self):
         self._check_error(
             "a && b",
-            "Maybe you meant 'and' or '&' instead of '&&'",
+            "Maybe you meant 'and' or '&' instead of '&&'?",
             lineno=1,
             end_lineno=1,
             offset=3,