collection: check for "Arguments" string (#1352)

Arguments is technically not a prototype, and the test is for the
toString result.

Relates to #1347.

Author: andreastt

index.html

@@ -5792,7 +5792,7 @@ <h3>Executing Script</h3>
 and whose:
 
 <ul>
-<li><a>initial value</a> of the <code>toString</code> <a>own property</a> is <code>Arguments</code>
+<li><a>initial value</a> of the <code>toString</code> <a>own property</a> is "<code>Arguments</code>"
 <li>instance of <a>Array</a>
 <li>instance of <a><code>FileList</code></a>
 <li>instance of <a><code>HTMLAllCollection</code></a>