Various cleanups of careless mistakes/omissions.

PR: 53149
Submitted by: Lukas Ertl <l.ertl@univie.ac.at>

Left out the critical part of my "public domain" template, a notice saying
that this file is (these files are) in the public domain.

PR: 53149

Commit rudimentary libufs manual pages, except for that for
getino(3)/putino(3), inode.c has been reworked in Perforce to the point
where a manual page may not be accurate. Certainly putino(3) has n

Commit rudimentary libufs manual pages, except for that for
getino(3)/putino(3), inode.c has been reworked in Perforce to the point
where a manual page may not be accurate. Certainly putino(3) has not
even been merged back yet.

These will need a lot of improvement for most applications, but they
document the API enough to get someone on their feet, most likely. The
best documentation still exists in the form of libufs(3) consumers in the
base system.

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