Update docs to include term meta

[macbookandrew]

The docblocks throughout wp-includes/meta.php consistently refer to comment, post, or user, when they should also include terms.

[macbookandrew]

docblock updates

[rachelbaker]

In 43557:

Docs: Update $meta_type descriptions to include ’term’ as a valid type in meta.php and class-wp-term-query.php.
Props macbookandrew.
Fixes #44751.

[SergeyBiryukov]

[43557] has been committed to the 4.9 branch.

Unless I'm missing something, it should have been committed to trunk first, and then backported to the branch.

[SergeyBiryukov]

Related: #44608

[rachelbaker]

@SergeyBiryukov Thanks, @boonebgorges was sitting next to me earlier and caught this for me. Fixing shortly.

[rachelbaker]

In 43560:

Docs: Update $meta_type descriptions to include ’term’ as a valid type in meta.php and class-wp-term-query.php.
Props macbookandrew.
Merges [43557] to trunk.
Fixes #44751.

[pento]

[43557] can be merged to the 5.0 branch.

[SergeyBiryukov]

In 43706:

Docs: Update $meta_type descriptions to include ’term’ as a valid type in meta.php and class-wp-term-query.php.

Props macbookandrew.
Merges [43557] to the 5.0 branch.
Fixes #44751.