Template: Update link to changelog entry documentation for pull requests

PULL_REQUEST_TEMPLATE.md

@@ -13,4 +13,4 @@ Before we can consider review and merge, please make sure the following list is
 If an entry in not applicable, you can check it or remove it from the list.
 
 - [ ] In case of feature or enhancement: documentation updated accordingly
-- [ ] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file.
+- [ ] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.

docs/faq.rst

@@ -565,7 +565,7 @@ Restart the Fail2Ban service.
 
   sudo systemctl restart fail2ban
 
-*Issue reference:* `85`_, `116`_, `171`_, `584`_, `592`_, `1727`_, `1857`_.
+*Issue reference:* `85`_, `116`_, `171`_, `584`_, `592`_, `1727`_.
 
 Users can't change their password from webmail
 ``````````````````````````````````````````````