There is a comment in the check's source explaining this (m4/geany-docutils.m4, GEANY_CHECK_DOCUTILS_HTML):

Of course!!! Thats where we all look for documentation ;-P

I guess this is a leftover from when the HTML was in in the VCS.

Will create an issue for after 1.26 to update HACKING to separate git build and tabball build sections so the commands and dependencies are clear(er).

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