Add the missing devm_watchdog_register_device() to watchdog-kernel-api.rst.
Convert some struct and function comments to kernel-doc format.
Add some UAPI comments for quick reference.
Correct some grammar and bulleted list format.

v2: modify comments in patch 3/5 per sashiko review

[PATCH v2 1/5] watchdog: add devm_watchdog_register_device() to watchdog-kernel-api
[PATCH v2 2/5] watchdog: linux/watchdog.h: repair kernel-doc comments
[PATCH v2 3/5] watchdog: uapi: add comments for what bit masks apply to
[PATCH v2 4/5] watchdog: core: clean up some comments
[PATCH v2 5/5] watchdog: dev: convert to kernel-doc comments

 Documentation/watchdog/watchdog-kernel-api.rst |    8 ++++
 drivers/watchdog/watchdog_core.c               |   12 +++---
 drivers/watchdog/watchdog_dev.c                |   30 +++++++--------
 include/linux/watchdog.h                       |    8 +++-
 include/uapi/linux/watchdog.h                  |    2 +
 5 files changed, 37 insertions(+), 23 deletions(-)

Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: linux-watchdog@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: linux-doc@vger.kernel.org