This documentation extends and follows the PSR (PHP Standard Recommendation) and the official Magento Coding Standards. These standards are recommendation to write transparent, understandable codes to guide developers to the right way in Magento 2.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.
Pull requests are welcome.