pg_advisory_unlock(null)

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/12/functions-admin.html
Description:

Hello!
There is no information in documentation about pg_advisory_unlock with NULL
value.
This call: select pg_advisory_unlock(null), returns null without reporting,
but according to the documentation it was expected either false or true.
Maybe add information about null value?
version: 12.10