.github: suggest using private browsing in pkgsite template
I opened #54872 without considering my browser's extensions and one of
them ended up being the cause of my issue. This seems to be a common
error.
To help that, add a suggestion to use a private/incognito tab/window
to the pkgsite issue template when reproducing issues. This probably
would have been enough for me to figure things out before opening my
issue.
Updates #54872, #47213
Change-Id: Ic61a3462cb902c91554cf9432aaae1222c6a991e
Reviewed-on: https://go-review.googlesource.com/c/go/+/427962
Run-TryBot: Dan Peterson <danp@danp.net> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>