Document how to choose a encryption key

The documentation still does not exist.

An encryption key is not a password; a password generator should not be used for an encryption key, since the latest has different and more strict requirements.

An encryption key should not be distinguishable from a random value. In fact, with PHP can be generated by a call to random_bytes(), provided that the required length is as least 32 bytes.

Updated the Baker settings to provide developers with examples of best practices. Also, updated point six of the documentation below to encourage developers to use long encryption keys.

https://www.drupal.org/docs/extending-drupal/contributed-modules/contrib... →