DOCS-11037 Describe $out stage process

Author: kallimachos

source/reference/operator/aggregation/out.txt

@@ -67,15 +67,14 @@ Replace Existing Collection
 
 If the collection specified by the :pipeline:`$out` operation already
 exists, then upon completion of the aggregation, the :pipeline:`$out`
-stage atomically replaces the existing collection with the new
-results collection using the following process:
-
-#. A temp collection is created.
-#. Indexes are copied from the destination collection to the temp collection.
-#. Documents are inserted into the temp collection.
-#. The temp collection calls `renameCollection
-   <https://docs.mongodb.com/manual/reference/method/db.collection.renameCollection/>`__,
-   providing the name of the destination collection and ``dropTarget: true``.
+stage atomically replaces the existing collection with the new results
+collection. Specifically, the :pipeline:`$out` operation:
+
+#. Creates a temp collection.
+#. Copies the indexes from the existing collection to the temp collection.
+#. Inserts the documents into the temp collection.
+#. Calls :method:`db.collection.renameCollection` with ``dropTarget: true``
+   to rename the temp collection to the destination collection.
 
 The :pipeline:`$out` operation does not change any indexes that existed on the
 previous collection. If the aggregation fails, the :pipeline:`$out` operation