Incorrect return type documented for get_post_custom()

[Chouby]

In the doc block of get_post_custom(), we can read that it always return an array. This is incorrect. As the return value is directly coming from get_post_meta(), the function can return, according to the doc of get_post_meta()

• An array of values
• False for an invalid $post_id (non-numeric, zero, or negative value).
• An empty string if a valid but non-existing post ID is passed.

[audrasjb]

Hey thanks for spotting this @Chouby,
Self-assigning for review and milestoning to 6.0.

Trac ticket: https://core.trac.wordpress.org/ticket/55249

[audrasjb]

In 52795:

Docs: Correct return type for get_post_custom().

Props chouby, audrasjb.
Fixes #55249.
See #54729.

Committed in https://core.trac.wordpress.org/changeset/52795