Runner Configuration Docs doesn't explain how to apply config changes
### Problem to solve The Runner [Advanced Configuration](https://docs.gitlab.com/runner/configuration/advanced-configuration.html) documentation doesn't explain how changes to the configuration file (`config.toml`) are applied. Does the runner need to be restarted or is there a command similar to `gitlab-ctl reconfigure`? ### Further details (None.) ### Proposal Answer the question above and make sure the documentation gives this answer as well. ### Who can address the issue Any engineer who is familiar with the Runner configuration. ### Other links/references
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