DOCSP-24243 adding insert operations to airports example (#1672)

* DOCSP-24243 adding insert operations to airports example

* DOCSP-24243 small fixes

Author: ltran-mdb

source/reference/operator/aggregation/graphLookup.txt

@@ -317,25 +317,30 @@ Across Multiple Collections
 Like :pipeline:`$lookup`, :pipeline:`$graphLookup` can access
 another collection in the same database.
 
-In the following example, a database contains two collections:
+For example, create a database with two collections: 
 
-- A collection ``airports`` with the following documents:
+- An ``airports`` collection with the following documents:
 
   .. code-block:: javascript
 
-     { "_id" : 0, "airport" : "JFK", "connects" : [ "BOS", "ORD" ] }
-     { "_id" : 1, "airport" : "BOS", "connects" : [ "JFK", "PWM" ] }
-     { "_id" : 2, "airport" : "ORD", "connects" : [ "JFK" ] }
-     { "_id" : 3, "airport" : "PWM", "connects" : [ "BOS", "LHR" ] }
-     { "_id" : 4, "airport" : "LHR", "connects" : [ "PWM" ] }
+   db.airports.insertMany( [
+      { "_id" : 0, "airport" : "JFK", "connects" : [ "BOS", "ORD" ] },
+      { "_id" : 1, "airport" : "BOS", "connects" : [ "JFK", "PWM" ] },
+      { "_id" : 2, "airport" : "ORD", "connects" : [ "JFK" ] },
+      { "_id" : 3, "airport" : "PWM", "connects" : [ "BOS", "LHR" ] },
+      { "_id" : 4, "airport" : "LHR", "connects" : [ "PWM" ] }
+   ] )
 
-- A collection ``travelers`` with the following documents:
+- A ``travelers`` collection with the following documents:
 
   .. code-block:: javascript
 
-     { "_id" : 1, "name" : "Dev", "nearestAirport" : "JFK" }
-     { "_id" : 2, "name" : "Eliot", "nearestAirport" : "JFK" }
-     { "_id" : 3, "name" : "Jeff", "nearestAirport" : "BOS" }
+   db.travelers.insertMany( [
+      { "_id" : 1, "name" : "Dev", "nearestAirport" : "JFK" },
+      { "_id" : 2, "name" : "Eliot", "nearestAirport" : "JFK" },
+      { "_id" : 3, "name" : "Jeff", "nearestAirport" : "BOS" }
+   ] )
+
 
 For each document in the ``travelers`` collection, the following
 aggregation operation looks up the ``nearestAirport`` value in the