Is your feature request related to a problem? Please describe.
I like to look up the source code for classes to see how they work & learn by inspecting the code. If I Google a class (e.g. PasswordHasher [Docs|Github]) then I can quickly find the correct docs.microsoft.com page, but one of the results shows the old aspnet repository as a result. But I can't easily find the correct source. I have to find the repo + file myself using GitHub search, and while I can (in the meanwhile) find the source code rather quickly, it might be easier if there is a link from the docs page to the correct source code page on GitHub.

Describe the solution you'd like
I would like to see a link from the docs page to the correct source-code page where this is possible / where the code is open source.

Quick mockup
Something like: