perf: update docs with influx testing instructions
perf: update docs with influx testing instructions

Change-Id: Iea024f4eb20167df03f114fd3a26bd291e7d128d
Reviewed-on: https://go-review.googlesource.com/c/build/+/450895
Reviewed-by: David Chase <ae171625adc8645b8b79b7e405a6da5aba5341e0@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Run-TryBot: Michael Knyszek <4473450dc5c88f06e1fb787f303d7805ec2aee65@google.com>

golang/build,golang/build,golang/build,golang/build