Rewrite rules don't need to be flushed on page save/delete

[duck_]

Since 3.3 it is no longer necessary to flush rewrite rules when saving or deleting a page.

I also removed most of the _save_post_hook() docs as they're already, or will become, incorrect.

[duck_]

Replying to duck_:

Since 3.3 it is no longer necessary to flush rewrite rules when saving or deleting a page.

#16687

I also removed most of the _save_post_hook() docs as they're already, or will become, incorrect.

For page template removal see [7900].

[ryan]

Looks good.

[duck_]

In [19727]:

Rewrite rules don't need to be flushed on every page save/delete as they're no longer verbose. Fixes #19636.