20221116-203146-2c1a971a

help: update "urls" help

Summary:
- get rid of insecure "http://" example
- don't mention "#" fragment behavior - I don't think this works in normal cases
- make clear that cacerts config doesn't apply to Git

Reviewed By: quark-zju

Differential Revision: D41347490

fbshipit-source-id: 95af879181ed9b3d201bdfa282524c18880e58cd