doc: Fix get-property and set-property offset and value descriptions

Those parameters need the <offset> and <val> parameters values.

Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>

Author: ikegami-t

Documentation/nvme-get-property.txt

@@ -19,8 +19,8 @@ Reads and shows the defined NVMe controller property for NVMe over Fabric.
 
 OPTIONS
 -------
--O::
---offset::
+-O <offset>::
+--offset=<offset>::
 	The offset of the property. One of CAP=0x0, VS=0x8, CC=0x14, CSTS=0x1c, NSSR=0x20
 
 -H::

Documentation/nvme-set-property.txt

@@ -19,12 +19,12 @@ Writes and shows the defined NVMe controller property for NVMe over Fabric.
 
 OPTIONS
 -------
--O::
---offset::
+-O <offset>::
+--offset=<offset>::
 	The offset of the property.
 
--V::
---value::
+-V <val>::
+--value=<val>::
 	The value of the property to be set.
 
 -o <fmt>::