Fix typo Id vs ID o_O

Author: CristinaSolana

manual/en-US/coding-standards/chapters/javascript.md

@@ -8,7 +8,7 @@ Variables and Functions should be camel case, starting with a lowercase letter:
 
 **Use names that describe what the string is:**
 
-`var element = document.getElementByID('elementId');`
+`var element = document.getElementById('elementId');`
 
 **Iterators are the exception**