fix pr and issue links in release notes

docs/source/release-notes/3.0.3.rst

@@ -8,37 +8,25 @@
   This raises an informative error when a plugin fails to load because its
   entry_point is not callable, which can happen with a plugin which is buggy or
   not updated for the current version of flake8. This is nicer than raising a
-  `PicklingError` about failing to pickle a module (See also `GitLab#164`_)
+  `PicklingError` about failing to pickle a module (See also :issue:`1014`)
 
 - Fix ``# noqa`` comments followed by a ``:`` and explanation broken by
-  3.0.0 (See also `GitLab#178`_)
+  3.0.0 (See also :issue:`1025`)
 
 - Always open our output file in append mode so we do not overwrite log
-  messages. (See also `GitLab#193`_)
+  messages. (See also :issue:`535`)
 
 - When normalizing path values read from configuration, keep in context the
   directory where the configuration was found so that relative paths work.
-  (See also `GitLab#194`_)
+  (See also :issue:`1036`)
 
 - Fix issue where users were unable to ignore plugin errors that were on
-  by default. (See also `GitLab#195`_)
+  by default. (See also :issue:`1037`)
 
 - Fix our legacy API StyleGuide's ``init_report`` method to actually override
-  the previous formatter. (See also `GitLab#200`_)
+  the previous formatter. (See also :issue:`136`)
 
 
 .. links
-.. _GitLab#164:
-    https://gitlab.com/pycqa/flake8/issues/164
-.. _GitLab#178:
-    https://gitlab.com/pycqa/flake8/issues/178
-.. _GitLab#193:
-    https://gitlab.com/pycqa/flake8/issues/193
-.. _GitLab#194:
-    https://gitlab.com/pycqa/flake8/issues/193
-.. _GitLab#195:
-    https://gitlab.com/pycqa/flake8/issues/195
-.. _GitLab#200:
-    https://gitlab.com/pycqa/flake8/issues/200
 .. _this Python bug report:
     https://bugs.python.org/issue27649