Remove URL support documentation from XML.

Refs cakephp/cakephp#4516
Merge pull request #1703 from cakephp/xml-changes

Remove URL support documentation from XML.
Added "Where to get Help in your Language" to all translations

https://github.com/cakephp/docs/pull/1702
Merge pull request #1704 from cakephp/3.0-help-in-french-in-all-translations

Added "Where to get Help in your Language" to all translations