Is it the temporal ambiguity (fixed by adding 'now', which is in the blurbs) or the descriptive versus command style (as with 'Returns' versus 'Return') that you do not like?  If the latter, the devguide could use augmentation.

The only relevant 'guidance' I found is this descriptive example in https://devguide.python.org/pullrequest/#making-good-commits: "the spam module is now more spammy".  This seems similar to "IDLE context menu now clears selection".  I don't see anything about commit messages in https://devguide.python.org/committing/, which seems like another likely place for such.