RDMA/sw/rdmavt/srq: Fix a couple of kernel-doc issues

RDMA/sw/rdmavt/srq: Fix a couple of kernel-doc issues

Fixes the following W=1 kernel build warning(s):

 drivers/infiniband/sw/rdmavt/srq.c:78: warning: Function parameter or member 'ibsrq' not described in 'rvt_create_srq'
 drivers/infiniband/sw/rdmavt/srq.c:78: warning: Excess function parameter 'ibpd' description in 'rvt_create_srq'
 drivers/infiniband/sw/rdmavt/srq.c:336: warning: Function parameter or member 'udata' not described in 'rvt_destroy_srq'

Link: https://lore.kernel.org/r/20210126124732.3320971-3-lee.jones@linaro.org
Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>