textproc/scdoc: fix homepage
Homepage link https://git.sr.ht/~sircmpwn/scdoc/ is dead (HTTP 404)
for more than a month and should be replaced by alive link (or link to
archive.org as a last resort).
Reported by: Repology
(cherry picked from commit 728f1c6fa6cb007ae104e81a058600f950d927ca)