Form.rst: add note to type password

Documentation/Form.rst

@@ -1350,6 +1350,8 @@ General input for any text.
 
 * *FormElement.parameter*:
 
+.. _`retype`:
+
   * *retype* = 1 (optional): Current input element will be rendered twice. The form can only submitted if both elements are equal.
 
     * *retypeLabel* = <text> (optional): The label of the second element.
@@ -1676,6 +1678,12 @@ Type: password
 
 * Like a `text` element, but every character is shown as an asterisk.
 
+Often the following form.Parameter arguments are used here:
+
+* retype, retypeLabel, retypeNote - see `retype`_.
+* :ref:`extraButtonPassword<extrabuttonpassword_>`.
+
+
 .. _`input-radio`:
 
 Type: radio