Documentation: nbd: Add list of module parameters

Add a list of available module parameters as attachment to the
documentation.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/Documentation/blockdev/nbd.txt b/Documentation/blockdev/nbd.txt
index 337946b..db242ea 100644
--- a/Documentation/blockdev/nbd.txt
+++ b/Documentation/blockdev/nbd.txt
@@ -19,3 +19,13 @@
 system, as the nbd-server is completely in userspace. In fact,
 the nbd-server has been successfully ported to other operating
 systems, including Windows.
+
+A) NBD parameters
+-----------------
+
+max_part
+	Number of partitions per device (default: 0).
+
+nbds_max
+	Number of block devices that should be initialized (default: 16).
+