util: Improve documentation of wl_iterator_result

Use declarative voice, remove the unnecessary doxygen \enum tag, and add
two see-also's. This keeps the output the same but makes the comment
voice consistent, a little more readable, and refers to documented
functions that use this enum type.

Signed-off-by: Yong Bakos <ybakos@humanoriented.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
1 file changed