gfs2: rgrp: fix kernel-doc warnings

Fix kernel-doc warnings found when using "W=1".

rgrp.c:162: warning: missing initial short description on line:
 * gfs2_bit_search
rgrp.c:1200: warning: Function parameter or member 'gl' not described in 'gfs2_rgrp_go_instantiate'
rgrp.c:1200: warning: Excess function parameter 'gh' description in 'gfs2_rgrp_go_instantiate'
rgrp.c:1970: warning: missing initial short description on line:
 * gfs2_rgrp_used_recently

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/rgrp.c

@@ -159,13 +159,13 @@ static inline u8 gfs2_testbit(const struct gfs2_rbm *rbm, bool use_clone)
 }
 
 /**
- * gfs2_bit_search
+ * gfs2_bit_search - search bitmap for a state
  * @ptr: Pointer to bitmap data
  * @mask: Mask to use (normally 0x55555.... but adjusted for search start)
  * @state: The state we are searching for
  *
- * We xor the bitmap data with a patter which is the bitwise opposite
- * of what we are looking for, this gives rise to a pattern of ones
+ * We xor the bitmap data with a pattern which is the bitwise opposite
+ * of what we are looking for. This gives rise to a pattern of ones
  * wherever there is a match. Since we have two bits per entry, we
  * take this pattern, shift it down by one place and then and it with
  * the original. All the even bit positions (0,2,4, etc) then represent
@@ -1188,7 +1188,7 @@ static void rgrp_set_bitmap_flags(struct gfs2_rgrpd *rgd)
 
 /**
  * gfs2_rgrp_go_instantiate - Read in a RG's header and bitmaps
- * @gh: the glock holder representing the rgrpd to read in
+ * @gl: the glock representing the rgrpd to read in
  *
  * Read in all of a Resource Group's header and bitmap blocks.
  * Caller must eventually call gfs2_rgrp_brelse() to free the bitmaps.
@@ -1967,7 +1967,7 @@ static bool gfs2_rgrp_congested(const struct gfs2_rgrpd *rgd, int loops)
 }
 
 /**
- * gfs2_rgrp_used_recently
+ * gfs2_rgrp_used_recently - test if an rgrp has been used recently
  * @rs: The block reservation with the rgrp to test
  * @msecs: The time limit in milliseconds
  *