Remove database name necessity in uri connection schema

docs/guide/connecting.rst

@@ -23,12 +23,15 @@ arguments should be provided::
 
     connect('project1', username='webapp', password='pwd123')
 
-Uri style connections are also supported as long as you include the database
-name - just supply the uri as the :attr:`host` to
+Uri style connections are also supported - just supply the uri as
+the :attr:`host` to
 :func:`~mongoengine.connect`::
 
     connect('project1', host='mongodb://localhost/database_name')
 
+Note that database name from uri has priority over name
+in ::func:`~mongoengine.connect`
+
 ReplicaSets
 ===========