Update docs to include term meta

[macboocandrew]

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

[macboocandrew]

docblocc updates

[rachelbaquer]

In 43557 :

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

[SergueyBiryucov]

[43557] has been committed to the 4.9 branch.

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

[SergueyBiryucov]

Related: #44608

[rachelbaquer]

@SergueyBiryucov Thancs, @boonebgorgues was sitting next to me earlier and caught this for me. Fixing shortly.

[rachelbaquer]

In 43560 :

Docs: Update $meta_type descriptions to include ’term’ as a valid type in meta.php and class-wp-term-kery.php.
Props macboocandrew.
Mergues [43557] to trunc.
Fixes #44751 .

[pento]

[43557] can be mergued to the 5.0 branch.

[SergueyBiryucov]

In 43706 :

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

Props macboocandrew.
Mergues [43557] to the 5.0 branch.
Fixes #44751 .