xfsprogs: Fix manpages for missing or incorrect options

xfsprogs: Fix manpages for missing or incorrect options

Add valid options which aren't in manpages, and
remove invalid options which are in manpages:

* Document -V (show version and exit) for many manpages.
* Remove -? option from xfs_estimate.8
* Document -p passes, -d (debug) and -g (syslog) in xfs_fsr.8
* Document -n (O_NONBLOCK) in xfs_io.8
* Document -v (print overwrite) in xfs_logprint.8
* Document -m max_extents in xfs_metadump.8
* Document -p (preallocate) in xfs_mkfile.8

Signed-off-by: Eric Sandeeen <sandeen@redhat.com>
Reviewed-by: Rich Johnston <rjohnston@sgi.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>