usb: gadget: ncm: Fix indentations in documentation of NCM section

Currently, the section of NCM which describes attributes are having wrong
indentation.

Fix this by following the correct format recommended.

Fixes: 1900daee ("usb: gadget: ncm: Add support to update wMaxSegmentSize via configfs")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/all/20240108160221.743649b5@canb.auug.org.au/Signed-off-by: Udipto Goswami <quic_ugoswami@quicinc.com>
Link: https://lore.kernel.org/r/20240108132720.7786-1-quic_ugoswami@quicinc.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/usb/gadget-testing.rst

@@ -448,7 +448,7 @@ Function-specific configfs interface
 The function name to use when creating the function directory is "ncm".
 The NCM function provides these attributes in its function directory:
 
-	===============   ==================================================
+	======================= ==================================================
 	ifname			network device interface name associated with this
 				function instance
 	qmult			queue length multiplier for high and super speed
@@ -457,8 +457,8 @@ The NCM function provides these attributes in its function directory:
 	dev_addr		MAC address of device's end of this
 				Ethernet over USB link
 	max_segment_size	Segment size required for P2P connections. This
-			  will set MTU to (max_segment_size - 14 bytes)
-	===============   ==================================================
+				will set MTU to 14 bytes
+	======================= ==================================================
 
 and after creating the functions/ncm.<instance name> they contain default
 values: qmult is 5, dev_addr and host_addr are randomly selected.