net/http: make DefaultTransport docs about HTTP proxy consistent
The changes improve the documentation for DefaultTransport, making
the style with how the HTTP proxy environment variables are being
referred to, consistent with the rest of the project's
documentation.
Also mention HTTPS_PROXY environment variables, as suggested in #32649.
Change-Id: I4e6b49881d7b30b5a0d4699531fa7c2929fc49f7
GitHub-Last-Rev:
2fc751937be685aa45acf43cf37b8ba2da124e4e
GitHub-Pull-Request: golang/go#54996
Reviewed-on: https://go-review.googlesource.com/c/go/+/430135
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Jenny Rakoczy <jenny@golang.org>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Jenny Rakoczy <jenny@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>