freevxfs: fix kernel-doc warnings

freevxfs: fix kernel-doc warnings

Fix multiple kernel-doc warnings in freevxfs:

fs/freevxfs/vxfs_subr.c:45: warning: Function parameter or member 'mapping' not described in 'vxfs_get_page'
fs/freevxfs/vxfs_subr.c:45: warning: Excess function parameter 'ip' description in 'vxfs_get_page'
2 warnings
fs/freevxfs/vxfs_subr.c:101: warning: expecting prototype for vxfs_get_block(). Prototype was for vxfs_getblk() instead
fs/freevxfs/vxfs_super.c:184: warning: expecting prototype for vxfs_read_super(). Prototype was for vxfs_fill_super() instead

Link: https://lkml.kernel.org/r/20230109022915.17504-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>