IB: Fix some documentation warnings

Parsing verbs.c with kernel-doc produce some warnings:

	./drivers/infiniband/core/verbs.c:2579: WARNING: Unexpected indentation.
	./drivers/infiniband/core/verbs.c:2581: WARNING: Block quote ends without a blank line; unexpected unindent.
	./drivers/infiniband/core/verbs.c:2613: WARNING: Unexpected indentation.
	./drivers/infiniband/core/verbs.c:2579: WARNING: Unexpected indentation.
	./drivers/infiniband/core/verbs.c:2581: WARNING: Block quote ends without a blank line; unexpected unindent.
	./drivers/infiniband/core/verbs.c:2613: WARNING: Unexpected indentation.

Address them by adding an extra blank line and converting the parameters
on one of the arguments to a table.

Link: https://lore.kernel.org/r/4c5466d0f450c5a9952138150c3485740b37f9c5.1586881715.git.mchehab+huawei@kernel.orgSigned-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/verbs.c

@@ -2574,6 +2574,7 @@ EXPORT_SYMBOL(ib_map_mr_sg_pi);
  * @page_size:     page vector desired page size
  *
  * Constraints:
+ *
  * - The first sg element is allowed to have an offset.
  * - Each sg element must either be aligned to page_size or virtually
  *   contiguous to the previous element. In case an sg element has a
@@ -2607,10 +2608,12 @@ EXPORT_SYMBOL(ib_map_mr_sg);
  * @mr:            memory region
  * @sgl:           dma mapped scatterlist
  * @sg_nents:      number of entries in sg
- * @sg_offset_p:   IN:  start offset in bytes into sg
- *                 OUT: offset in bytes for element n of the sg of the first
+ * @sg_offset_p:   ==== =======================================================
+ *                 IN   start offset in bytes into sg
+ *                 OUT  offset in bytes for element n of the sg of the first
  *                      byte that has not been processed where n is the return
  *                      value of this function.
+ *                 ==== =======================================================
  * @set_page:      driver page assignment function pointer
  *
  * Core service helper for drivers to convert the largest