[starlarkproto] Remove stale comment.
[starlarkproto] Remove stale comment.

R=tandrii@chromium.org, 40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org

Change-Id: I406ff5a03f025dbdd447813f68cc6ea7f2d39f3a
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3213141
Auto-Submit: Vadim Shtayura <9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org>
Reviewed-by: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>
Commit-Queue: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go