docs: Removing TODO from doc comment

The TODO in the doc comment was ending up in the published docs. Moved it
to a separate, non-doc comment (// instead of /** */) so the doc engine will ignore it.

NO_TEST , fixes a doc bug (no code edits).

Change-Id: I98e1f4f2b5ff7a5879bd90ca52e5635b350d36ab
Fixes: 270126340
Test: [go/abtd docs build (verified the doc in the output]