DOCSP 24278 - adding insert operations to vehicles example (#1668)

* DOCSP-24278 adding insert operation to vehicles example

* DOCSP-24278 adding insert operations to vehicles example

* DOCSP-24278 adding space

Author: ltran-mdb

source/reference/operator/aggregation/addFields.txt

@@ -132,13 +132,19 @@ Adding Fields to an Embedded Document
 .. _add-field-to-embedded:
 
 Use dot notation to add new fields to embedded documents.
-A collection called ``vehicles`` contains the following documents:
+
+For example, create a collection called ``vehicles`` with
+the following documents:
 
 .. code-block:: javascript
 
-   { _id: 1, type: "car", specs: { doors: 4, wheels: 4 } }
-   { _id: 2, type: "motorcycle", specs: { doors: 0, wheels: 2 } }
-   { _id: 3, type: "jet ski" }
+   db.vehicles.insertMany(
+      [
+         { _id: 1, type: "car", specs: { doors: 4, wheels: 4 } },
+         { _id: 2, type: "motorcycle", specs: { doors: 0, wheels: 2 } },
+         { _id: 3, type: "jet ski" }
+      ]
+   )
 
 The following aggregation operation adds a new field ``fuel_type`` to
 the embedded document ``specs``.