ASoC: doc: dapm: minor rewording

Slightly reword for better readability: replace "PM" -> "power management
frameworks", add missing comma.

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Link: https://lore.kernel.org/r/20240426-dapm-docs-v2-3-87b07547eb5b@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: lucaceresoli

Documentation/sound/soc/dapm.rst

@@ -7,8 +7,8 @@ Description
 
 Dynamic Audio Power Management (DAPM) is designed to allow portable
 Linux devices to use the minimum amount of power within the audio
-subsystem at all times. It is independent of other kernel PM and as
-such, can easily co-exist with the other PM systems.
+subsystem at all times. It is independent of other kernel power
+management frameworks and, as such, can easily co-exist with them.
 
 DAPM is also completely transparent to all user space applications as
 all power switching is done within the ASoC core. No code changes or