[resultdb] Fix a comment
[resultdb] Fix a comment

NewRecorder function no longer exists.

R=332b6c56634d0f63001046c664a2370006a02420@chromium.org

Change-Id: I0509238ce3043c32e25f33d564eabf1b9ba15820
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2021367
Auto-Submit: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
Commit-Queue: Chan Li <332b6c56634d0f63001046c664a2370006a02420@chromium.org>
Reviewed-by: Chan Li <332b6c56634d0f63001046c664a2370006a02420@chromium.org>

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