Update installation.md with receive.advertisePushOptions

See https://gitlab.com/gitlab-org/gitlab-ce/issues/33061#note_37473342

doc/install/installation.md

@@ -367,6 +367,9 @@ sudo usermod -aG redis git
     # Enable packfile bitmaps
     sudo -u git -H git config --global repack.writeBitmaps true
+    
+    # Enable push options
+    sudo -u git -H git config --global receive.advertisePushOptions true
     # Configure Redis connection settings
     sudo -u git -H cp config/resque.yml.example config/resque.yml