docs(button): Add info what is rendered when SingleClick is enabled

Author: pepinho24

controls/button/functionality/single-click-button.md

@@ -16,7 +16,9 @@ position: 0
 
 The single click button (**Figure 1**) is used to avoid multiple postbacks/callbacks to the server. This feature is useful in database and/or e-mail send scenarios when the developer should prevent submitting of identical content multiple times to the server.
 
->note The single click functionality is available only for buttons that make postbacks. For example the functionality is not available for the LinkButton because it acts as an anchor element.
+>note The single click functionality is available only for buttons that make postbacks. For example the functionality is not available for the LinkButton because it acts as an anchor element. 
+>
+>When the single click functionality is enabled, the button is rendered as `<button type="button">` instead of a `<button type="submit">` and that takes precedence over the `UseSubmitBehavior` property.
 
 >caption Figure 1: RadButton with SingeClick functionality before and after click.