Change snippet syntax to the new Jekyll tag.

tests/app/ui/button/button.md

@@ -8,10 +8,10 @@ previous_url: /ApiReference/ui/button/HOW-TO
 # Button
 ### Declaring button module
 Button module is required to use any button feature.
-<snippet id='button-require'/>
+{%snippet button-require%}
 
 Other frequently used modules when working with buttons include:
-<snippet id='button-require-others'/>
+{%snippet button-require-others%}
 
 ### Attaching event handler for the button tap event.
 ``` XML
@@ -20,13 +20,13 @@ Other frequently used modules when working with buttons include:
 </Page>
 ```
 ### Creating a button
-<snippet id='button-create'/>
+{%snippet button-create%}
 
 ### Setting the text of a button
-<snippet id='button-settext'/>
+{%snippet button-settext%}
 
 ### Responding to the tap event
-<snippet id='button-tap'/>
+{%snippet button-tap%}
 
 ### Binding text property directly to model
-<snippet id='button-bind'/>
+{%snippet button-bind%}