xfs: Update xfs_log_commit_cil() comments

xfs_log_commit_iclog() function has been removed by commits 93b8a585:
	xfs: remove the deprecated nodelaylog option

Beginning from Linux 3.3, only delayed logging is supported so that
we call xfs_log_commit_cil() at xfs_trans_commit() only, remove the
useless comments so.
Signed-off-by: NJie Liu <jeff.liu@oracle.com>
Reviewed-by: NMark Tinguely <tinguely@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>

fs/xfs/xfs_log_cil.c

@@ -668,10 +668,6 @@ xlog_cil_push_foreground(
  * transaction to the checkpoint context so we carry the busy extents through
  * to checkpoint completion, and then unlock all the items in the transaction.
  *
- * For more specific information about the order of operations in
- * xfs_log_commit_cil() please refer to the comments in
- * xfs_trans_commit_iclog().
- *
  * Called with the context lock already held in read mode to lock out
  * background commit, returns without it held once background commits are
  * allowed again.