Auto merge of #4127 - TimMoore:comment-on-git-vs-https-github-urls, r=segiddins
Auto merge of #4127 - TimMoore:comment-on-git-vs-https-github-urls, r=segiddins

Explain why we don't use HTTPS for github sources

There are frequent pull requests proposing this change, which has already been merged to 2-0-dev.

Hopefully, this will help avoid so much wasted time.

bronzdoc/bundler,seanlinsley/bundler,RochesterinNYC/bundler,mpapis/bundler,dilumnavanjana/bundler,bronzdoc/bundler,mvz/bundler,mpapis/bundler,seanlinsley/bundler,asutoshpalai/bundler,dilumnavanjana/bundler,mvz/bundler,asutoshpalai/bundler,bundler/bundler,RochesterinNYC/bundler,bundler/bundler