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.

Built from https://develop.svn.wordpress.org/trunk@30776


git-svn-id: http://core.svn.wordpress.org/trunk@30766 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When using the spacebar to select something in "bulk select" mode, don't scroll the page.

Props avryl.
Fixes #30622.

Built from https://develop.svn.wordpress.org/trunk@30777


git-svn-id: http://core.svn.wordpress.org/trunk@30767 1a063a9b-81f0-0310-95a4-ce76da25c4cd