xfsprogs: fix ioctl_xfs_geometry manpage naming

xfsprogs: fix ioctl_xfs_geometry manpage naming

Somehow "fsop_/FSOP_" snuck into this manpage's name, filename, and
ioctl name.  It's not XFS_IOC_FSOP_GEOMETRY, it's XFS_IOC_FSGEOMETRY
so change all references, including the man page name, filename, and
references from xfsctl(3).

(the structure and flags do have the fsop_ string, which certainly
makes this a bit confusing)

Fixes: b427c816847e ("man: create a separate GEOMETRY ioctl manpage")
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>