ci: pull request template includes sample format (#1357)

[gcf-owl-bot]

Source-Link: googleapis/synthtool@e122cb0
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:387835a1375a0049ec44e02542c844302854c732d8291bdf8e472c0ff70a8f67

[gcf-merge-on-green]

Merge-on-green attempted to merge your PR for 6 hours, but it was not mergeable because either one of your required status checks failed, one of your required reviews was not approved, or there is a do not merge label. Learn more about your required status checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks. You can remove and reapply the label to re-run the bot.

[gcf-merge-on-green]

Merge-on-green attempted to merge your PR for 6 hours, but it was not mergeable because either one of your required status checks failed, one of your required reviews was not approved, or there is a do not merge label. Learn more about your required status checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks. You can remove and reapply the label to re-run the bot.

[gcf-merge-on-green]

Merge-on-green attempted to merge your PR for 6 hours, but it was not mergeable because either one of your required status checks failed, one of your required reviews was not approved, or there is a do not merge label. Learn more about your required status checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks. You can remove and reapply the label to re-run the bot.

[suztomo]

[INFO] grpc-google-cloud-redis-v1 2.2.1-SNAPSHOT .......... SUCCESS [  0.920 s]
[INFO] Google Cloud Redis 2.2.1-SNAPSHOT .................. FAILURE [25:28 min]
[INFO] Google Cloud Redis BOM 2.2.1-SNAPSHOT .............. SUCCESS [  0.536 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  25:38 min
[INFO] Finished at: 2022-03-01T02:42:31Z
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-failsafe-plugin:3.0.0-M4:verify (default) on project google-cloud-redis: There was a timeout or other error in the fork -> [Help 1]

Retrying.

[gcf-merge-on-green]

Merge-on-green attempted to merge your PR for 6 hours, but it was not mergeable because either one of your required status checks failed, one of your required reviews was not approved, or there is a do not merge label. Learn more about your required status checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks. You can remove and reapply the label to re-run the bot.