ASoC: docs: Fix stale and misspelled references

While reading some docs, I have found some minor
misspelled words and some parts that could be improved.

The ASoC USB documentation refers to the USB DPCM backend link as DCPM
in two places. The ASoC platform documentation still points readers to
the old DPCM.txt name. The ALSA configuration guide also has two
references that omit their current subdirectory.

Fix a few stale and misspelled references in the ALSA and ASoC
documentation and update the references and fix a typo in the ASoC index.

Assisted-by: Codex:GPT-5.5
Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260508-asoc-doc-fixes-v1-1-b53eec42e340@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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