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Replace `( $fn )( ...$args )` syntax with equivalent `call_user_func( $fn, ...$args )` to prevent an issue with the WordPress documentation parser. The parser would fail when encountering this syntax, preventing documentation generation. Developed in https://github.com/WordPress/wordpress-develop/pull/10907. Follow-up to [58304]. Props dmsnell, jonsurrell. See #64224, #61348. Built from https://develop.svn.wordpress.org/trunk@61624 git-svn-id: http://core.svn.wordpress.org/trunk@60935 1a063a9b-81f0-0310-95a4-ce76da25c4cd