DOCSP-36124 Adds upsertedCount to updateOne and updateMany (#6152) (#6231)

* DOCSP-36124 Adds upsertedCount to updateOne and updateMany

* Adds upsertedCount to examples

Author: kennethdyer

source/reference/method/db.collection.updateMany.txt

@@ -181,6 +181,8 @@ The method returns a document that contains:
 
 - ``upsertedId`` containing the ``_id`` for the upserted document
 
+- ``upsertedCount`` containing the number of upserted documents
+
 Access Control
 --------------
 
@@ -585,7 +587,8 @@ The operation returns:
       "acknowledged" : true,
       "matchedCount" : 0,
       "modifiedCount" : 0,
-      "upsertedId" : ObjectId("56fc5dcb39ee682bdc609b02")
+      "upsertedId" : ObjectId("56fc5dcb39ee682bdc609b02"),
+      "upsertedCount": 1
    }
 
 The collection now contains the following documents:

source/reference/method/db.collection.updateOne.txt

@@ -178,7 +178,9 @@ The method returns a document that contains:
 
 - ``modifiedCount`` containing the number of modified documents
 
-- ``upsertedId`` containing the ``_id`` for the upserted document.
+- ``upsertedId`` containing the ``_id`` for the upserted document
+
+- ``upsertedCount`` containing the number of upserted documents
 
 - A boolean ``acknowledged`` as ``true`` if the operation ran with
   :term:`write concern` or ``false`` if write concern was disabled
@@ -657,7 +659,8 @@ Since ``upsert:true`` the document is ``inserted`` based on the ``filter`` and
       "acknowledged" : true,
       "matchedCount" : 0,
       "modifiedCount" : 0,
-      "upsertedId" : 4
+      "upsertedId" : 4,
+      "upsertedCount": 1
    }
 
 The collection now contains the following documents: