RDMA/rtrs-srv: Fix typo

It should mean region here.

Fixes: 9cb83748 ("RDMA/rtrs: server: main functionality")
Link: https://lore.kernel.org/r/20201023074353.21946-7-jinpu.wang@cloud.ionos.comSigned-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/ulp/rtrs/rtrs-srv.h

@@ -62,7 +62,7 @@ struct rtrs_srv_op {
 
 /*
  * server side memory region context, when always_invalidate=Y, we need
- * queue_depth of memory regrion to invalidate each memory region.
+ * queue_depth of memory region to invalidate each memory region.
  */
 struct rtrs_srv_mr {
 	struct ib_mr	*mr;