For example, .NET release changes are on Github like here (https://github.com/Microsoft/dotnet/blob/master/releases/net46/dotnet46-changes.md) and refer to a TFS bug number and a reference to Please include those numbers in your communication if you wish to contact us to obtain more information..
Where or how would I go about asking about one of those specific bugs? A post on these forums? Or is there some other contact method? Mainly I'm curious if an issue I ran into recently was due to one of the changes referenced in the 4.6 release notes.