Documentation/sysfs-block-rnbd: Add descriptions for remap_device and resize

Two sysfs entries, remap_device and resize, are missing.
Signed-off-by: Gioh Kim <gi-oh.kim@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Link: https://lore.kernel.org/r/20210419073722.15351-3-gi-oh.kim@ionos.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

Documentation/ABI/testing/sysfs-block-rnbd

@@ -44,3 +44,15 @@ Date:		Feb 2020
 KernelVersion:	5.7
 Contact:	Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
 Description:	Contains the device access mode: ro, rw or migration.
+
+What:		/sys/block/rnbd<N>/rnbd/resize
+Date:		Feb 2020
+KernelVersion:	5.7
+Contact:	Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description:	Write the number of sectors to change the size of the disk.
+
+What:		/sys/block/rnbd<N>/rnbd/remap_device
+Date:		Feb 2020
+KernelVersion:	5.7
+Contact:	Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description:	Remap the disconnected device if the session is not destroyed yet.