Fix installation instruction step order

i80and · i80and · commit 454acba7ea4e · 2018-06-27T15:50:50.000-04:00
diff --git a/source/includes/steps-install-mongodb-on-debian.yaml b/source/includes/steps-install-mongodb-on-debian.yaml
@@ -6,6 +6,7 @@ source:
 ---
 title: Create a ``/etc/apt/sources.list.d/mongodb-org-{+version+}.list`` file for MongoDB.
 stepnum: 2
+level: 4
 ref: sources-list
 action:
   pre: |
