suggestions from @max-schaefer

Co-Authored-By: Max Schaefer <54907921+max-schaefer@users.noreply.github.com>

javascript/ql/src/Statements/IgnoreArrayResult.qhelp

@@ -5,7 +5,7 @@
 <overview>
 <p>
 The <code>concat</code>, <code>join</code> and <code>slice</code> methods are
-pure and does not modify any of the inputs or the array the method was called 
+pure and do not modify any of the inputs or the array the method was called 
 on. It is therefore generally an error to ignore the return value from a call
 to one of these methods. 
 </p>

javascript/ql/src/Statements/IgnoreArrayResult.ql

@@ -1,10 +1,10 @@
 /**
  * @name Ignoring result from pure array method
- * @description The array methods do not modify the array, ignoring the result of such a call is therefore generally an error.
+ * @description Ignoring the result of an array method that does not modify its receiver is generally an error.
  * @kind problem
  * @problem.severity warning
  * @id js/ignore-array-result
- * @tags maintainability,
+ * @tags maintainability
  *       correctness
  * @precision high
  */
@@ -16,7 +16,7 @@ DataFlow::SourceNode callsArray(DataFlow::TypeBackTracker t, DataFlow::MethodCal
   isIgnoredPureArrayCall(call) and
   (
     t.start() and
-    result = call.getReceiver()
+    result = call.getReceiver().getALocalSource()
     or
     exists(DataFlow::TypeBackTracker t2 | result = callsArray(t2, call).backtrack(t2, t))
   )