docs(configuration): Update incubator-devlake-website/docs/Configuration/GitLab.md (#808)

Update the step 1 - GitLab instead of GitHub

Author: ahmadfikrin

docs/Configuration/GitLab.md

@@ -8,7 +8,7 @@ Visit Config UI: `http://localhost:4000`.
 
 ## Step 1 - Add Data Connections
 
-On the Connections page, you can select GitHub and create a new connection or it.
+On the Connections page, you can select GitLab and create a new connection or it.
 
 ### Step 1.1 - Authentication