Apply the suggestion from the PR

wordpress-coding-standards/php.md

@@ -81,6 +81,7 @@ Text that goes into HTML or XML attributes should be escaped so that single or d
 ### Writing include/require statements
 
 Because `include[_once]` and `require[_once]` are language constructs, they do not need parentheses around the path. There should only be one space between the path and the include/require keywords.
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 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 having been 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.