Add docs about static / dynamic status check names

doc/user/project/integrations/github.md

@@ -30,6 +30,19 @@ with `repo:status` access granted:
 1. Select the "Active" checkbox.
 1. Paste the token you've generated on GitHub
 1. Enter the path to your project on GitHub, such as `https://github.com/username/repository`
+1. Optionally check "Static status check names" checkbox to enable static status check names.
 1. Save or optionally click "Test Settings".
 
+#### Static / dynamic status check names
+
+Since GitLab 11.5 it is possible to opt-in to using static status check names.
+
+This makes it possible to mark these status checks as _Required_ on GitHub.
+If you check "Static status check names" checkbox on the integration page, your
+GitLab instance host name is going to be appended to a status check name,
+whereas in case of dynamic status check names, a branch name is going to be
+appended.
+
+Dynamic status check name is a default behavior.
+
 ![Configure GitHub Project Integration](img/github_configuration.png)