Fix an invalid type for the `$section` parameter in the `do_settings_fields()` DocBlock.

Props ipm-frommen.
See #30098.

Built from https://develop.svn.wordpress.org/trunk@30018


git-svn-id: http://core.svn.wordpress.org/trunk@30018 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix the `$location` parameter type in the `unregister_nav_menu()` DocBlock.

`$location` is a string, not an array.

Props ipm-frommen.
Fixes #30098.

Built from https://develop.svn.wordpress.org/trunk@30019


git-svn-id: http://core.svn.wordpress.org/trunk@30019 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Users screen in network admin:
* Remove unused $key variables.
* Rename $val to $user_id for clarity.

props ipm-frommen.
fixes #30096.
Built from https://develop.svn.wordpress.org/trunk@30020


git-svn-id: http://core.svn.wordpress.org/trunk@30020 1a063a9b-81f0-0310-95a4-ce76da25c4cd