Closes #6565; Add documentation to certs.where.

[tanrbobanr]

Closes #6565 by adding documentation to certs.where. A wrapper was used so that the __doc__ attribute of certifi.where would be preserved, and to allow for greater intellisense coverage. The second issue brought up in #6565 could not be addressed, as the CA-certs default path is only taken from certs.where, and can be overridden on a per-instance level of Session instances (for example).

[sigmavirus24]

This addresses only one sliver of that issue, not the core of what they're asking for.

[tanrbobanr]

This addresses only one sliver of that issue, not the core of what they're asking for.

Yeah, this is my first PR so I'm kinda new to this. From what I was able to see, the cacerts_loaded function would not really be possible unless it was a method of Session, as (to my knowledge) the only way to change the bundle path is through verify (a Session argument) and through merge_environment_settings (a method of Session), meaning there would be no way to get this information globally (again, to my knowledge).