This changeset renames the `wp_ajax_save_attachment` action to `wp_ajax_save_attachment_updated` to avoid confusion with the similarly named `wp_ajax_save-attachment` action. This also add a dockblock note to indicate that when checking if an action is being done, `doing_action( 'wp_ajax_save-attachment' )` may be used if that is more convenient.
Follow-up to [55106].
Props azaozz, sc0ttkclark, costdev.
Fixes#23148
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