infiniband-diags: fix saquery rst/man page

Signed-off-by: Ira Weiny <weiny2@llnl.gov>
infiniband-diags/saquery: Add support for ServiceID in PathRecord querying

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
Signed-off-by: Ira Weiny <weiny2@llnl.gov>