AttributeList --> NamedNodeMap

Since there is no such thing as an AttributeList, don't say "attributes"
is one.

Doc/lib/xmldom.tex

@@ -162,7 +162,7 @@ This is a read-only attribute.
 \end{memberdesc}
 
 \begin{memberdesc}[Node]{attributes}
-An \class{AttributeList} of attribute objects.  Only elements have
+An \class{NamedNodeList} of attribute objects.  Only elements have
 actual values for this; others provide \code{None} for this attribute.
 This is a read-only attribute.
 \end{memberdesc}