Fix doc snippets. (#3882)

* Remove a duplicate snippet: image-create-datauri
* Remove a reference to a missing snippet: console-dump
* Readd a missing snippet: imagesource-resname
* Fix a broken snippet reference: timer-set-ten
* Fix a broken snippet reference: timer-set-fifty

tests/app/timer/timer.md

@@ -13,10 +13,10 @@ previous_url: /ApiReference/timer/HOW-TO
 {%snippet timer-set-zero%}
 
 ### Evaluates an expression after a specified number of milliseconds.
-{%snippet timer-set-fivehundred%}
+{%snippet timer-set-ten%}
 
 ### Cancels the evaluation with the clearTimeout method.
-{%snippet timer-set-twothousands%}
+{%snippet timer-set-fifty%}
 
 ### Evaluates an expression each time a specified number of milliseconds has elapsed.
 {%snippet timer-set-expression%}