[3.13] gh-101100: Fix some Sphinx reference warnings in ``whatsnew/2.6.rst`` (GH-139236)#139569

vstinner merged 1 commit intopython:3.13python/cpython:3.13from

miss-islington:backport-04a2f80-3.13miss-islington/cpython:backport-04a2f80-3.13Copy head branch name to clipboard