docs: watchdog-kernel-api: general cleanups

Fix grammar and punctuation.
Add a missing struct member (pm_nb) and its description.
Add a subheading for Helper Functions between the struct descriptions
and just pure helper functions.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260228010402.2389343-5-rdunlap@infradead.org>
This commit is contained in:
Randy Dunlap 2026-02-27 17:04:01 -08:00 • committed by Jonathan Corbet
commit bb227ba68c