net/http: document that Client can make HTTPS connections

[gopherbot]

by feedback.test.account:

https://feedback.corp.google.com/#/Report/1318530134

Description:
Should also mention HTTPS/SSL connections with default settings can be invoked with the
simple Post and PostForm functions by just giving it an "https://" url.

UI language: en
Detected language: en

[adg]

Comment 1:

Labels changed: added documentation, go1.2maybe, removed restrict-view-owner.

Status changed to Accepted.

[rsc]

Comment 2:

This issue was closed by revision 1b0bffa.

Status changed to Fixed.