dashboard: fix two typos in comments
dashboard: fix two typos in comments

Change-Id: Id11d08e511b1dce0f107cd1faf404a5a37fed895
Reviewed-on: https://go-review.googlesource.com/111262
Reviewed-by: Andrew Bonventre <682ad9f487f614f19e8b7cc5d340bdc8e1c1b128@golang.org>

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