Patch for repo groups API documentation

[Louis Bertrand]

Hi,
I started documenting the repository group API. Here's a patch, but it might be messy because of conflicts due to whitespace adjustments while I was working on it.
Let me know if it's a problem and I'll base the changeset on a more recent version.
All the best
 --Louis

--
Louis Bertrand, P.Eng.
Professor, Faculty of Science, Engineering and Information Technology
Durham College

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