Connect to database with git user, not gitlab

doc/install/databases.md

@@ -27,7 +27,7 @@ GitLab supports the following databases:
     mysql> \q
     # Try connecting to the new database with the new user
-    sudo -u gitlab -H mysql -u gitlab -p -D gitlabhq_production
+    sudo -u git -H mysql -u gitlab -p -D gitlabhq_production
 ## PostgreSQL
@@ -47,5 +47,5 @@ GitLab supports the following databases:
     template1=# \q
     # Try connecting to the new database with the new user
-    sudo -u gitlab -H psql -d gitlabhq_production
+    sudo -u git -H psql -d gitlabhq_production