Reading the man-page for ul(1) noticed reference to colcrt and went to learn more but found it didn't exist. Noticed that there was no man-page for nroff either when I checked.
$ man ul | grep -B1 colcrt
colcrt(1), man(1), nroff(1)
$ man colcrt nroff
No manual entry for colcrt
No manual entry for nroff
A commit references this bug:
Date: Wed Oct 7 14:43:16 UTC 2020
New revision: 366516
ul(1): Remove references to colcrt(1) and nroff(1)
colcrt(1) and nroff(1) where removed in r319664.
Remove references to these commands in ul(1) man page.
Reported by: email@example.com
Approved by: manpages (gbe@)
Differential Revision: https://reviews.freebsd.org/D2614
Thanks for reporting!