Merge branch '6.1' into 6.2

* 6.1:
  Update serializer.rst

Author: javiereguiluz

components/serializer.rst

@@ -1090,8 +1090,11 @@ always as a collection.
     behavior can be changed with the optional context key ``XmlEncoder::DECODER_IGNORED_NODE_TYPES``.
 
     Data with ``#comment`` keys are encoded to XML comments by default. This can be
-    changed with the optional ``$encoderIgnoredNodeTypes`` argument of the
-    ``XmlEncoder`` class constructor.
+    changed by adding the ``\XML_COMMENT_NODE`` option to the ``XmlEncoder::ENCODER_IGNORED_NODE_TYPES``
+    key of the ``$defaultContext`` of the ``XmlEncoder`` constructor or
+    directly to the ``$context`` argument of the ``encode()`` method::
+    
+        $xmlEncoder->encode($array, 'xml', [XmlEncoder::ENCODER_IGNORED_NODE_TYPES => [\XML_COMMENT_NODE]]);
 
 The ``XmlEncoder`` Context Options
 ..................................