add docmention for blkparse man page

Hi Jens,

misc improvement for blkparse man page:

patch-1: remove a duplicated entry for flag 'M', back or front merge.
patch-2: add documetation for "'R' requeue request" trace actoin.

Weiping Zhang (2):
blkparse: remove duplicated entry for flag M
blkparse: add documetation for 'R' requeue request

 doc/blkparse.1 | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

2.9.4

Applied, thanks.

Jens Axboe