Use tuple notation

Author: domenic

dom.bs

@@ -273,7 +273,7 @@ NULL, or U+003E (>).
  nor <var>prefix</var> is "<code>xmlns</code>", then <a>throw</a> a "{{NamespaceError!!exception}}"
  {{DOMException}}.
 
- <li><p>Return <var>namespace</var>, <var>prefix</var>, and <var>localName</var>.
+ <li><p>Return (<var>namespace</var>, <var>prefix</var>, <var>localName</var>).
 </ol>
 
 
@@ -5791,7 +5791,7 @@ method steps are:
 <var>namespace</var>, <var>qualifiedName</var>, and <var>options</var>, are as follows:
 
 <ol>
- <li><p>Let <var>namespace</var>, <var>prefix</var>, and <var>localName</var> be the result of
+ <li><p>Let (<var>namespace</var>, <var>prefix</var>, <var>localName</var>) be the result of
  [=validate and extract|validating and extracting=] <var>namespace</var> and
  <var>qualifiedName</var> given "<code>element</code>".
 
@@ -6039,7 +6039,7 @@ steps are:
 method steps are:
 
 <ol>
- <li><p>Let <var>namespace</var>, <var>prefix</var>, and <var>localName</var> be the result of
+ <li><p>Let (<var>namespace</var>, <var>prefix</var>, <var>localName</var>) be the result of
  [=validate and extract|validating and extracting=] <var>namespace</var> and
  <var>qualifiedName</var> given "<code>attribute</code>".
 
@@ -7365,7 +7365,7 @@ method steps are:
 method steps are:
 
 <ol>
- <li><p>Let <var>namespace</var>, <var>prefix</var>, and <var>localName</var> be the result of
+ <li><p>Let (<var>namespace</var>, <var>prefix</var>, <var>localName</var>) be the result of
  [=validate and extract|validating and extracting=] <var>namespace</var> and
  <var>qualifiedName</var> given "<code>element</code>".