Feature summary (what you would like to be able to do and where):
When install an extension the web installer should link to mediawiki.org for the extension/skin for more information

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
When running the installer it could be helpful to find more documentation for an extension.

Benefits (why should this be implemented?):
Easier to found some more information about an extension from the installer