Update SDL-Tridion-2011.md
Update SDL-Tridion-2011.md

URL was wrong, pointing to a 404. Also removed version of product, as there's been quite a few updates to this produce since this initial announcement.
ODataOrg/odataorg.github.io,ralfhandl/odataorg.github.io,ODataOrg/odataorg.github.io,OData/odataorg.github.io,ralfhandl/odataorg.github.io,OData/odataorg.github.io