docs: Fix typo ("occured" -> "occurred")

CommonTypos linter was warning about this typo in the generated doc.
Also slightly improved grammar of sentence fragment. No changes to code,
just to docs.

Bug: 263824202
Change-Id: I060f4b76631297ca10fb72cf5ea2de7774b328f4
Test: [go/abtd docs build]
1 file changed