Dear Maintainer,
Opening the man page of update-fmtutil opens the man page of update-updmap,
which has no content on fmtutil. Instead a man page explaining update-fmtutil
should be shown.
This is also true for version 6.15 according to
https://manpages.debian.org/unstable/tex-common/update-fmtutil.8.en.html
where only the added footer mentions update-fmtutil:
Source file: update-fmtutil.8.en.gz (from tex-common 6.15)
Source last updated: 2017-01-11T16:18:24Z
Converted to HTML: 2020-08-08T11:16:56Z
Best wishes,
Gábor