Batuhan Taskaya firstname.lastname@example.org added the comment:
Personally, I feel that it most largely benefits more significant documentation changes that involve modification of existing markup or the addition of new markup, rather than all documentation PRs. So a manually added label to trigger it makes the most sense to me. This would be very similar to the recently added "test-with-buildbots" label.
+1, It would be so much useful in cases like GH 19928.