Sergey Biryukov 94555079eb Docs: Clarify the usage of null for auto_update_{$type} filter.
The value is internally used to detect whether nothing has hooked into this filter.

Props audrasjb, pbiron, johnbillion, SergeyBiryukov.
Fixes #50848.
Built from https://develop.svn.wordpress.org/trunk@48909


git-svn-id: http://core.svn.wordpress.org/trunk@48671 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-08-31 13:20:07 +00:00
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