Dear Reporter, Maintainer.
AVFS never had a manpage. There is plenty of documentation for packager and
user. You would refer to the file
/usr/share/doc/avfs/README.avfs-fuse and
/usr/share/doc/avfs/README.gz
the file /usr/bin/avfsd takes no options and is loaded as a daemon.
Files/devices are accessed as
ls $HOME/.avfs/$PWD/file.gz#
for example.
Maybe report the request upstream. But for most, the READMEs (which I
contributed to) should be fine.
Would suggest closing this bug as WONTFIX since it is an upstream request,
not anything Debian can/should fix.