Fix typo

Rommel Martinez · Rommel Martinez · commit edcc3d9c2d5f · 2018-03-22T18:04:16.000+08:00
diff --git a/lispguide.xml b/lispguide.xml
@@ -3545,7 +3545,7 @@ Robert Brown
     <SUMMARY>
       You should not use <code>NCONC</code>;
       you should use <code>APPEND</code> instead,
-      or better, better data structures.
+      or better data structures.
     </SUMMARY>
     <BODY>
       <p>
