Add astropy/astropy.github.com#509 as well

Co-authored-by: Hans Moritz Günther <[email protected]>

Author: pllim

policies/coco-transition-checklist.md

@@ -15,7 +15,7 @@ as needed.
     - Add to coordinators Google group
 - [ ] Slack: Make new Coordinators channel and invite new CoCo
 - [ ] Update Roles page
-    - Example: [astropy.github.com#508](https://github.com/astropy/astropy.github.com/pull/508)
+    - Example: [astropy.github.com#508](https://github.com/astropy/astropy.github.com/pull/508) and [astropy.github.com#509](https://github.com/astropy/astropy.github.com/pull/509) (could be done in same PR next time)
 - [ ] Update CoCo Operating Policies with current CoCo membership
     - Example: [astropy-project#323](https://github.com/astropy/astropy-project/pull/323)
 - [ ] Project mailing list(s); Add as owners of the