JS: address doc review

javascript/ql/src/Statements/LoopIterationSkippedDueToShifting.qhelp

@@ -19,7 +19,7 @@ Determine what the loop is supposed to do:
 
 <ul>
   <li>
-    If the intention is to remove <em>every occurence</em> of a certain value, decrement the loop counter after removing an element, to counterbalance
+    If the intention is to remove <em>every occurrence</em> of a certain value, decrement the loop counter after removing an element, to counterbalance
     the shift.
   </li>
   <li>

javascript/ql/src/Statements/LoopIterationSkippedDueToShifting.ql

@@ -1,5 +1,5 @@
 /**
- * @name Loop iteration skipped due to shifting.
+ * @name Loop iteration skipped due to shifting
  * @description Removing elements from an array while iterating over it can cause the loop to skip over some elements,
  *              unless the loop index is decremented accordingly. 
  * @kind problem