Fix kramdown issue in Verify docs

doc/development/contributing/verify/index.md

@@ -189,8 +189,7 @@ Slack channel (GitLab team members only).
 After your merge request is merged by a maintainer, it is time to release it to
 users and the wider community. We usually do this with feature flags.
 While not every merge request needs a feature flag, most merge
-requests in Verify should have feature flags. [**TODO** link to docs about what
-needs a feature flag and what doesn’t].
+requests in Verify should have [feature flags](https://about.gitlab.com/handbook/product-development-flow/feature-flag-lifecycle/#when-to-use-feature-flags).
 
 If you already follow the advice on this page, you probably already have a
 few metrics and perhaps a few loggers added that make your new code observable