ABI: configfs-usb-gadget-uac2: fix a broken table

Changeset af6cbe09920 ("usb: gadget: f_uac2: add volume and mute support")
added some new elements to the table but didn't care enough to actually
adjust the columns, causing the output to be broken as warned by
Sphinx when producing the documentation.

Readjust it for it to be a valid ReST table.

Fixes: eaf6cbe0 ("usb: gadget: f_uac2: add volume and mute support")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/d253819a4c201b942d754682bb91dd278300fb79.1632740376.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -4,23 +4,30 @@ KernelVersion:	3.18
 Description:
 		The attributes:
 
-		=========  ============================
-		c_chmask   capture channel mask
-		c_srate    capture sampling rate
-		c_ssize    capture sample size (bytes)
-		c_sync     capture synchronization type (async/adaptive)
-		c_mute_present	capture mute control enable
+		=====================	=======================================
+		c_chmask		capture channel mask
+		c_srate			capture sampling rate
+		c_ssize			capture sample size (bytes)
+		c_sync			capture synchronization type
+					(async/adaptive)
+		c_mute_present		capture mute control enable
 		c_volume_present	capture volume control enable
-		c_volume_min	capture volume control min value (in 1/256 dB)
-		c_volume_max	capture volume control max value (in 1/256 dB)
-		c_volume_res	capture volume control resolution (in 1/256 dB)
-		fb_max     maximum extra bandwidth in async mode
-		p_chmask   playback channel mask
-		p_srate    playback sampling rate
-		p_ssize    playback sample size (bytes)
-		p_mute_present	playback mute control enable
+		c_volume_min		capture volume control min value
+					(in 1/256 dB)
+		c_volume_max		capture volume control max value
+					(in 1/256 dB)
+		c_volume_res		capture volume control resolution
+					(in 1/256 dB)
+		fb_max			maximum extra bandwidth in async mode
+		p_chmask		playback channel mask
+		p_srate			playback sampling rate
+		p_ssize			playback sample size (bytes)
+		p_mute_present		playback mute control enable
 		p_volume_present	playback volume control enable
-		p_volume_min	playback volume control min value (in 1/256 dB)
-		p_volume_max	playback volume control max value (in 1/256 dB)
-		p_volume_res	playback volume control resolution (in 1/256 dB)
-		=========  ============================
+		p_volume_min		playback volume control min value
+					(in 1/256 dB)
+		p_volume_max		playback volume control max value
+					(in 1/256 dB)
+		p_volume_res		playback volume control resolution
+					(in 1/256 dB)
+		=====================	=======================================