docs: ABI: fixed formatting in configfs-usb-gadget-uac2

Added missing tab, line breaks.

Fixes: e3088eb ("docs: ABI: added missing num_requests param to UAC2")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20220108105608.10726-1-pavel.hofman@ivitera.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/ABI/testing/configfs-usb-gadget-uac2

@@ -30,6 +30,6 @@ Description:
 					(in 1/256 dB)
 		p_volume_res		playback volume control resolution
 					(in 1/256 dB)
-		req_number	the number of pre-allocated requests for both capture
-					and playback
+		req_number		the number of pre-allocated requests
+					for both capture and playback
 		=====================	=======================================