Please update documentation for site.ini and transform.ini: TransformationGroup

• TransformationGroup documentation page
• Multi-language support for URL aliases documentation page

There are only three rules specified: urlalias_compat, urlalias, urlalias_iri but afaik, there are three more by default: identifier, uppercase, and lowercase.

Also, I think it's possible to develop your own rules based on the commands existent in transform.ini. This could be better explained.