docs: Update documentation generation with missing entries

This adds missing entries for documentation generation, both for tests
and the API reference.

The list of tests is made complete and ordered alphabetically, with
modified descriptions for consistency.

More files are added to the API reference, with a minimalistic
description block added to them when it was missing.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@linux.intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
8 files changed