ASoC: doc: Internally link to Writing an ALSA Driver docs

ASoC codec and platform driver docs contain reference to writing ALSA
driver docs, as an external link. Use :doc: directive for the job
instead.

Signed-off-by: Bagas Sanjaya <[email protected]>

Author: bagasme

Documentation/sound/soc/codec.rst

@@ -131,8 +131,8 @@ The codec driver also supports the following ALSA PCM operations:-
 	int (*prepare)(struct snd_pcm_substream *);
   };
 
-Please refer to the ALSA driver PCM documentation for details.
-https://www.kernel.org/doc/html/latest/sound/kernel-api/writing-an-alsa-driver.html
+Please refer to the :doc:`ALSA driver PCM documentation
+<../kernel-api/writing-an-alsa-driver>` for details.
 
 
 DAPM description

Documentation/sound/soc/platform.rst

@@ -45,8 +45,8 @@ snd_soc_component_driver:-
 	...
   };
 
-Please refer to the ALSA driver documentation for details of audio DMA.
-https://www.kernel.org/doc/html/latest/sound/kernel-api/writing-an-alsa-driver.html
+Please refer to the :doc:`ALSA driver documentation
+<../kernel-api/writing-an-alsa-driver>` for details of audio DMA.
 
 An example DMA driver is soc/pxa/pxa2xx-pcm.c