Sergey Biryukov 6b72fd183f Twenty Twenty-One: Replace include_once with require_once for required classes. ...

Per [https://developer.wordpress.org/coding-standards/wordpress-coding-standards/php/#writing-include-require-statements WordPress PHP coding standards], it is ''strongly recommended'' to use `require[_once]` for unconditional includes. When using `include[_once]`, PHP will throw a warning when the file is not found but will continue execution, which will almost certainly lead to other errors/warnings/notices being thrown if your application depends on the file loaded, potentially leading to security leaks. For that reason, `require[_once]` is generally the better choice as it will throw a `Fatal Error` if the file cannot be found.

Follow-up to [49216], [49633].

Props wpfy.
See #57839.
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Twenty Twenty-One: Improve documentation per the documentation standards:

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