WordPress 6.9 doc updates

[jonathanbossenger]

Tracking issue for any documentation updates that may be required for the WordPress 6.9 merge proposal.

[gziolo]

Let's also stop using numbers for files and titles in the /docs folder so we can more easily change order when referencing these documents. Noted also here.

[aaronware]

Just adding a note for an advanced section to provide an when using "ability_class" and extending the base WP_Ability Class. @felixarntz Chat bot demo a solid base example of using it properly. The current version does not take advantage of "meta" so the example will need to adjusted slightly for that

[jonathanbossenger]

Reorder the docs list

#87 (comment)

[jonathanbossenger]

@gziolo I've completed most of the items either linked or commented here on #117. Will work on the extending WP_Ability class improvements tomorrow, but the rest can be reviewed in the meantime.