message: docs: maintainer label duty
diff: * Triage GitHub issues and perform pull request reviews for other maintainers and the community.
  The areas of specialization listed in [OWNERS.md](OWNERS.md) can be used to help with routing
  an issue/question to the right person.
  +* During GitHub issue triage, apply all applicable [labels](https://github.com/envoyproxy/envoy/labels)
  + to each new issue. Labels are extremely useful for future issue follow up. Which labels to apply
  + is somewhat subjective so just use your best judgment. A few of the most important labels that are
  + not self explanatory are:
  + * **beginner**: Mark any issue that can reasonably be accomplished by a new contributor with
  + this label.
  + * **help wanted**: Unless it is immediately obvious that someone is going to work on an issue (and
  + if so assign it), mark it help wanted.
  + * **question**: If it's unclear if an issue is immediately actionable, mark it with the
  + question label. Questions are easy to search for and close out at a later time. Questions
  + can be promoted to other issue types once it's clear they are actionable (at which point the
  + question label should be removed).
  * Make sure that ongoing PRs are moving forward at the right pace or closing them.
  * Participate when called upon in the [security release process](SECURITY_RELEASE_PROCESS.md). Note
  that although this should be a rare occurrence, if a serious vulnerability is found, the process
  