DOCS-13584 Add reference that commands fail against system collections in 4.4 notes

Author: ianf-mongodb

source/release-notes/4.4.txt

@@ -1042,6 +1042,10 @@ When creating a collection inside a transaction:
   :dbcommand:`create` command or its helper
   :method:`db.createCollection()`.
 
+- The :method:`db.createCollection()` method fails if 
+  executed against a 
+  :doc:`system collection </reference/system-collections>`.
+
 When :ref:`creating an index <transactions-operations-ddl-explicit>`
 inside a transaction:
 
@@ -1051,6 +1055,10 @@ inside a transaction:
 - You can create an index on a new empty collection created earlier
   in the same transaction.
 
+- The :method:`db.collection.createIndex()` method
+  fails if executed against a 
+  :doc:`system collection </reference/system-collections>`.
+
 For more details, see :ref:`transactions-create-collections-indexes`.
 
 MongoDB 4.4 adds a new parameter