DOCSP-22720 collection.drop() always drops FLE2 collections (#1195)

* DOCSP-22720 collection.drop() always drops FLE2 collections

* internal review feedback

* external review feedback

Author: jmd-mongo

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

@@ -86,6 +86,20 @@ Behavior
 
 - .. include:: /includes/extracts/5.0-changes-drop-sharding.rst
 
+- Starting in MongoDB 6.0, the :method:`db.collection.drop()` method 
+  drops the specified collection and any internal collections related 
+  to encrypted fields. 
+
+  .. warning::
+  
+     The :method:`db.collection.drop()` method's behavior differs from
+     the driver's ``drop`` method's behavior. The driver's connection 
+     must have automatic encryption enabled in order to drop both the 
+     specified collection and any internal collections related to
+     encrypted fields. ``mongosh`` *always* drops the specified 
+     collection and any internal collections related to encrypted
+     fields.
+  
 Resource Locking
 ~~~~~~~~~~~~~~~~