replace hardcoded links to bugs.python.org with extlinks

Signed-off-by: oleg.hoefling <[email protected]>

Author: hoefling

doc/en/changelog.rst

@@ -1397,7 +1397,7 @@ Bug Fixes
 - :issue:`5914`: pytester: fix :py:func:`~_pytest.pytester.LineMatcher.no_fnmatch_line` when used after positive matching.
 
 
-- :issue:`6082`: Fix line detection for doctest samples inside :py:class:`python:property` docstrings, as a workaround to `bpo-17446 <https://bugs.python.org/issue17446>`__.
+- :issue:`6082`: Fix line detection for doctest samples inside :py:class:`python:property` docstrings, as a workaround to :bpo:`17446`.
 
 
 - :issue:`6254`: Fix compatibility with pytest-parallel (regression in pytest 5.3.0).

doc/en/conf.py

@@ -162,6 +162,7 @@
 
 _repo = "https://github.com/pytest-dev/pytest"
 extlinks = {
+    "bpo": ("https://bugs.python.org/issue%s", "bpo-%s"),
     "pypi": ("https://pypi.org/project/%s/", ""),
     "issue": (f"{_repo}/issues/%s", "issue #"),
 }