Mark errata fixed in the 3rd print

Author: marijnh

html/errata.html

@@ -20,7 +20,7 @@ <h1>Errata<div style="font-size: 70%"><a class="subtlelink" href="index.html">El
 
 <p>Issues whose section title is followed by a superscript ¹ were
 fixed after the first print of the book, and will not be present in
-later prints.</p>
+later prints. Those followed by ² were fixed in the third print.</p>
 
 <h2>Introduction</h2>
 
@@ -30,7 +30,7 @@ <h2>Introduction</h2>
 
 <h2>Chapter 2</h2>
 
-<p><strong>Page 32</strong> (while and do Loops): The <code>var
+<p><strong>Page 32</strong> (while and do Loops²): The <code>var
 name</code> example unintentionally exits the loop when the dialog is
 canceled, because browsers have a built-in global
 variable <code>name</code> whose values are implicitly converted to
@@ -44,7 +44,7 @@ <h2>Chapter 9</h2>
 be <code>Number(match[2]) - 1</code>, subtracting one to compensate
 for the fact that months start at zero in this interface.</p>
 
-<p><strong>Page 162</strong> (Backtracking): The regular expression
+<p><strong>Page 162</strong> (Backtracking²): The regular expression
 should have another <code>+</code> sign after the <code>[\da-f]</code>
 group to match what it is described as matching. The diagram for the
 expression is similarly missing an arrow looping back around the
@@ -65,7 +65,7 @@ <h2>Chapter 11</h2>
 
 <h2>Chapter 12</h2>
 
-<p><strong>Page 209</strong> (The Web): In the third paragraph I claim
+<p><strong>Page 209</strong> (The Web²): In the third paragraph I claim
 that the U in “URL” stands for <em>Universal</em>, whereas it actually
 stands for <em>Uniform</em>.</p>
 
@@ -96,7 +96,7 @@ <h2>Chapter 17</h2>
 
 <h2>Chapter 18</h2>
 
-<p><strong>Page 316</strong> (Fields): The <code>checked</code>
+<p><strong>Page 316</strong> (Fields²): The <code>checked</code>
 attribute in the <code>file</code> field at the bottom of the example
 doesn't mean anything, and should not be there.</p>