Update Telemetry README.md doc
Update Telemetry README.md doc

Change-Id: I7ae16ebd54f9f78a580ec50ae97ab3f2a6517a9f
Reviewed-on: https://chromium-review.googlesource.com/830118
Reviewed-by: Juan Antonio Navarro Pérez <1649bb5e6b9eafe026580e338065dc64ba6b80b2@chromium.org>
Commit-Queue: Ned Nguyen <8e49e083cfcfb68517585b2e78d68c2fd2b70562@google.com>

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