[GH] Emphasize the "Test:" string requirement
[GH] Emphasize the "Test:" string requirement

Just makes it clear that it's not just a suggestion or polite ask

## Testing

Test: N/A

This is an imported pull request from https://github.com/androidx/androidx/pull/45.

Resolves #45
Github-Pr-Head-Sha: 2e57b708696b73daa373334cc0927c337618d2f8
GitOrigin-RevId: aaaaac2656c44d910662ca368087ac6411da3f31
Change-Id: Ia95ceace33be80d535c17fc38e94dff55dbf189b

AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx