Flesh out information in the DocBlock for `wp_register_sidebar_widget()`.

Includes:
* Documenting the `$options` parameter in hash notation style
* Converting `@uses` tags to `@global`
* Various backtick-escaping.

See #30315.


git-svn-id: https://develop.svn.wordpress.org/trunk@30776 602fd350-edb4-49c9-b593-d223f7449a82
When using the spacebar to select something in "bulk select" mode, don't scroll the page.

Props avryl.
Fixes #30622.


git-svn-id: https://develop.svn.wordpress.org/trunk@30777 602fd350-edb4-49c9-b593-d223f7449a82