Fix an incomplete docblock for `wp_create_categories()` as part of `$post/$post_id` cleanup.

See #28388.

Built from https://develop.svn.wordpress.org/trunk@28975


git-svn-id: http://core.svn.wordpress.org/trunk@28764 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove backticks on `$post` variables in some short parameter descriptions.

See [28653], [28654].
See #28388.

Built from https://develop.svn.wordpress.org/trunk@28976


git-svn-id: http://core.svn.wordpress.org/trunk@28765 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clarify the inline documentation for `plugins_url()` to reflect that it also works with mu-plugins.

Props ericlewis.
See #28499.

Built from https://develop.svn.wordpress.org/trunk@28977


git-svn-id: http://core.svn.wordpress.org/trunk@28766 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Simplify the setup-config.php UI flow and load process.

When no configuration file is detected, we now redirect to setup-config.php. This process now uses the WordPress bootstrap, rather than a set of fragile hacks.

fixes #28740.

Built from https://develop.svn.wordpress.org/trunk@28978


git-svn-id: http://core.svn.wordpress.org/trunk@28767 1a063a9b-81f0-0310-95a4-ce76da25c4cd