davidbaumwald 133c4e2e50 Docs: Clarify return results for a non-existing ID in metadata functions. ...

[48658] documented that various metadata functions return false for an invalid ID. However, that does not clarify what an invalid ID is: a non-numeric, zero, or negative value. This change adds the clarification in all relevant metadata function docblocks.

Props icopydoc, SergeyBiryukov, davidkryzaniak, audrasjb.
Fixes #51797.
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git-svn-id: http://core.svn.wordpress.org/trunk@50253 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2021-04-02 15:49:05 +00:00

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