ASoC: doc: ReSTize pops_clicks.txt

A simple conversion from a plain text file.
The file name was changed from "pops_clicks" to "pops-clicks" to align
with others.
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Documentation/sound/soc/index.rst

@@ -13,3 +13,4 @@ The documentation is spilt into the following sections:-
    dapm
    platform
    machine
+   pops-clicks

Documentation/sound/alsa/soc/pops_clicks.txt → Documentation/sound/soc/pops-clicks.rst

+=====================
 Audio Pops and Clicks
 =====================
 
@@ -20,6 +21,7 @@ currently, however future audio codec hardware will have better pop and click
 suppression.  Pops can be reduced within playback by powering the audio
 components in a specific order. This order is different for startup and
 shutdown and follows some basic rules:-
+::
 
    Startup Order :- DAC --> Mixers --> Output PGA --> Digital Unmute
   
@@ -36,6 +38,7 @@ Capture artifacts are somewhat easier to get rid as we can delay activating the
 ADC until all the pops have occurred. This follows similar power rules to
 playback in that components are powered in a sequence depending upon stream
 startup or shutdown.
+::
 
    Startup Order - Input PGA --> Mixers --> ADC