errata: p.73, 'a' -> 'an'

Change-Id: Id6cc21a89a675f3164de40f4e9bd070f809b2073

errata.html

@@ -18,7 +18,7 @@ pre {
 <body>
   <h1>Errata</h1>
   <p>
-    <b>p.9, ¶2</b>: for "can compared", read "can be compared".
+    <b>p.9, ¶2</b>: For "can compared", read "can be compared".
     (Thanks to Antonio Macías Ojeda, 2015-10-22.
     Corrected in the second printing.)
   </p>
@@ -52,15 +52,15 @@ pre {
   </p>
 
   <p>
-    <b>p.52, ¶2</b>: for "an synonym", read "a synonym", twice.
+    <b>p.52, ¶2</b>: For "an synonym", read "a synonym", twice.
     (Corrected in the second printing.)
   </p>
 
   <p>
-    <b>p.68</b>: the table of UTF-8 encodings is missing a bit from each first byte.
+    <b>p.68</b>: The table of UTF-8 encodings is missing a bit from each first byte.
     The corrected table is shown below.
     (Thanks to Akshay Kumar, 2015-11-02.
-    Corrected in the Second printing.)
+    Corrected in the second printing.)
   </p>
   
   <pre>
@@ -70,13 +70,18 @@ pre {
 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx  65536−0x10ffff  (other values unused)</pre>
 
   <p>
-    <b>p.74</b>: the comment in <code>gopl.io/ch3/printints</code> should say
+    <b>p.73, ¶1</b>: For "a exercise", read "an exercise".
+    (Thanks to vrajmohan, 2015-12-28.)
+  </p>
+
+  <p>
+    <b>p.74</b>: The comment in <code>gopl.io/ch3/printints</code> should say
     <code>fmt.Sprint</code>, not <code>fmt.Sprintf</code>.
     (Corrected in the second printing.)
   </p>
 
   <p>
-    <b>p.76</b>: the comment <code>// "time.Duration 5ms0s</code> should have
+    <b>p.76</b>: The comment <code>// "time.Duration 5ms0s</code> should have
     a closing double-quotation mark.
     (Corrected in the second printing.)
   </p>
@@ -92,25 +97,25 @@ pre {
   </p>
 
   <p>
-    <b>p.132, code display following ¶3</b>: the final comment
+    <b>p.132, code display following ¶3</b>: The final comment
     should read:<br/>
     <code>// compile error: can't assign func(int, int) int to func(int) int</code><br/>
     (Thanks to Toni Suter, 2015-11-21.)
   </p>
 
   <p>
-    <b>p.166, ¶2</b>: for "way", read "a way".
+    <b>p.166, ¶2</b>: For "way", read "a way".
   </p>
 
   <p>
-    <b>p.200, <code>TestEval</code> function</b>: the format string in the final call to
+    <b>p.200, <code>TestEval</code> function</b>: The format string in the final call to
     <code>t.Errorf</code> should format <code>test.env</code> with <code>%v</code>,
     not <code>%s</code>.
     (Thanks to Mitsuteru Sawa, 2015-12-07.)
   </p>
 
   <p>
-    <b>p.362</b>: the <code>gopl.io/ch13/bzip</code> program
+    <b>p.362</b>: The <code>gopl.io/ch13/bzip</code> program
     does not comply with the
     <a href='https://github.com/golang/proposal/blob/master/design/12416-cgo-pointers.md'>proposed rules for passing pointers between Go and C code</a>
     because the C function <code>bz2compress</code> temporarily stores a Go