fix(mdb): migration pt2

Author: ldecarvalho-doc

menu/navigation.json

@@ -2414,6 +2414,16 @@
                 "label": "How to",
                 "slug": "how-to"
               },
+              {
+                "items": [
+                  {
+                    "label": "Migrating to Managed MongoDB®",
+                    "slug": "migrating-to-managed-mongodb"
+                  }
+                ],
+                "label": "Additional Content",
+                "slug": "additional-content"
+              },
               {
                 "items": [
                   {