Editorial: fix typo in "adoption agency" algorithm

Closes #10816.

source

@@ -131205,7 +131205,7 @@ document.body.appendChild(text);
        the <span>stack of open elements</span> with an entry for the new element, and let
        <var>node</var> be the new element.</p></li>
 
-       <li><p>If <var>last node</var> is <var>furthestBlock</var>, then move the aforementioned
+       <li><p>If <var>lastNode</var> is <var>furthestBlock</var>, then move the aforementioned
        bookmark to be immediately after the new <var>node</var> in the <span>list of active
        formatting elements</span>.</p></li>
 
@@ -145922,6 +145922,7 @@ INSERT INTERFACES HERE
   Kornel Lesinski,
   上野 康平 (UENO, Kouhei),
   Kris Northfield,
+  Kristian Spangsege,
   Kristof Zelechovski,
   Krzysztof Maczy&#x0144;ski,
   &#x9ed2;&#x6fa4;&#x525b;&#x5fd7; (Kurosawa Takeshi),