bpo-13120: fix typo with test_issue13120() method name (GH-12250)


Incorrect issue number '13210' added in 539ee5da6f.

https://bugs.python.org/issue13120
(cherry picked from commit 9139f926a8d8e5b71830cb7e10b0807836b5e9a4)

Co-authored-by: Daniel Hahler <github@thequod.de>
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index f573f5f..c2c4ca2 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -1262,9 +1262,9 @@
             any('main.py(5)foo()->None' in l for l in stdout.splitlines()),
             'Fail to step into the caller after a return')
 
-    def test_issue13210(self):
-        # invoking "continue" on a non-main thread triggered an exception
-        # inside signal.signal
+    def test_issue13120(self):
+        # Invoking "continue" on a non-main thread triggered an exception
+        # inside signal.signal.
 
         with open(support.TESTFN, 'wb') as f:
             f.write(textwrap.dedent("""