Use gh-156186 instead of #156186 in test comment

Co-authored-by: Maurycy Pawłowski-Wieroński <maurycy@maurycy.com>

Author: vasiliyk

Lib/test/test_pyrepl/test_pyrepl.py

@@ -2205,7 +2205,7 @@ def test_python_basic_repl(self):
     def test_bracketed_paste_newline_after_end_marker(self):
         # A newline arriving in the same read as the closing marker must
         # execute the pasted block instead of being inserted as text.
-        # See #156186.
+        # See gh-156186.
         env = os.environ.copy()
         commands = ("\x1b[200~x = 1\nprint(f'^{x=}')\n\x1b[201~"
                     "\n"