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>