Change snippet syntax to the new Jekyll tag.

tests/app/timer.md

@@ -7,19 +7,19 @@ previous_url: /ApiReference/timer/HOW-TO
 ---
 # Timer module
 ### How to require timer module
-<snippet id='timer-require'/>
+{%snippet timer-require%}
 
 ### Evaluates an expression after 0 milliseconds.
-<snippet id='timer-set-zero'/>
+{%snippet timer-set-zero%}
 
 ### Evaluates an expression after a specified number of milliseconds.
-<snippet id='timer-set-fivehundred'/>
+{%snippet timer-set-fivehundred%}
 
 ### Cancels the evaluation with the clearTimeout method.
-<snippet id='timer-set-twothousands'/>
+{%snippet timer-set-twothousands%}
 
 ### Evaluates an expression each time a specified number of milliseconds has elapsed.
-<snippet id='timer-set-expression'/>
+{%snippet timer-set-expression%}
 
 ### Cancel the interval previously started using the setInterval method.
-<snippet id='timer-set-interval'/>
+{%snippet timer-set-interval%}