sysutils/fusefs-funionfs: move man page to share/man
```
commit 49d8eefab5d70e22b43686cc61f561dac9a00cdf (HEAD -> main)
Author: Gabriel M. Dutra <dutra@FreeBSD.org>
Date: Tue Jan 30 18:07:37 2024 -0300
sysutils/fusefs-funionfs: move man page to share/man
Approved by: dbaio(mentor),garga(mentor)
Differential Revision: https://reviews.freebsd.org/D43674
```