Convert tiny-shmem.c function comments to kernel-doc.  Add parameters and
convert/fix other kernel-doc in shmem.c.
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>