Fix a typo in Chapter 14 (and note in errata)

Author: marijnh

14_dom.md

@@ -437,7 +437,7 @@ node. This function is then used to add an attribution to a quote.
   document.getElementById("quote").appendChild(
     elt("footer", "—",
         elt("strong", "Karl Popper"),
-        ", preface to the second editon of ",
+        ", preface to the second edition of ",
         elt("em", "The Open Society and Its Enemies"),
         ", 1950"));
 </script>

html/errata.html

@@ -48,7 +48,12 @@ <h2>Chapter 10</h2>
 
 <p><strong>Page 168</strong> (1st) <em>Modules as Building Blocks</em>: In “each
 needs it own private scope“, it should say “<em>its</em> own private
-scope“.
+scope“.</p>
+
+<h2>Chapter 14</h2>
+
+<p><strong>Page 234</strong> (2nd) <em>Creating Nodes</em>: In the
+code, “edition” is misspelled as “editon”.</p>
 
 <h2>Chapter 16</h2>