Website updates for removed Array config options

website/guide/custombehavior.html

@@ -133,24 +133,6 @@ the splice operation to the end of the array.</p>
 Duktape uses this behavior by default.  The strict standards compliant behavior can
 be enabled by disabling the config option <code>DUK_USE_NONSTD_ARRAY_SPLICE_DELCOUNT</code>.</p>
 
-<h2>Array.prototype.concat() trailing non-existent elements</h2>
-
-<p>When the result of an array <code>concat()</code> would have trailing non-existent
-elements, the standard behavior is to ignore them so that they are not reflected in
-the result <code>length</code>.  Real world behavior is to include them in the result
-value <code>length</code>.  See
-<a href="https://github.com/svaarala/duktape/blob/master/tests/ecmascript/test-bi-array-proto-concat-nonstd-trailing.js">test-bi-array-proto-concat-nonstd-trailing.js</a>.</p>
-
-<p>The real world behavior seems consistent in other engines (V8, Rhino, Spidermonkey
-at least), so Duktape uses the real world behavior by default.  The strict standards compliant
-behavior can be enabled by disabling the config option <code>DUK_USE_NONSTD_ARRAY_CONCAT_TRAILER</code>.</p>
-
-<h2>Array.prototype.map() trailing non-existent elements</h2>
-
-<p>Similar issue as with <code>Array.prototype.concat()</code>, see
-<a href="https://github.com/svaarala/duktape/blob/master/tests/ecmascript/test-bi-array-proto-map-nonstd-trailing.js">test-bi-array-proto-map-nonstd-trailing.js</a>.  The strict standards compliant behavior can be
-enabled by disabling the config option <code>DUK_USE_NONSTD_ARRAY_MAP_TRAILER</code>.</p>
-
 <h2>Setter/getter key argument</h2>
 
 <p>Ecmascript standard behavior is that setters and getters are not given