Revert changes to setAttributeNode and setAttributeNodeNS method steps

Author: lukewarlow

Diff for: dom.bs

@@ -6918,14 +6918,11 @@ method steps are to return the result of
 <a lt="get an attribute by namespace and local name">getting an attribute</a> given
 <var>namespace</var>, <var>localName</var>, and <a>this</a>.
 
-<p>The <dfn method for=Element><code>setAttributeNode(<var>attr</var>)</code></dfn> methods steps are to
+<p>The <dfn method for=Element><code>setAttributeNode(<var>attr</var>)</code></dfn> and
+<dfn method for=Element><code>setAttributeNodeNS(<var>attr</var>)</code></dfn> methods steps are to
 return the result of <a lt="set an attribute">setting an attribute</a> given <var>attr</var> and
 <a>this</a>.
 
-<p>The <dfn method for=Element><code>setAttributeNodeNS(<var>attr</var>)</code></dfn> methods steps are to
-return the result of <a lt="set an attribute">setting an attribute</a> given <var>attr</var>,
-<a>this</a>.
-
 <p>The <dfn method for=Element><code>removeAttributeNode(<var>attr</var>)</code></dfn> method steps
 are: