hixie: typo (whatwg r5454)

hixie: typo (whatwg r5454)

http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.4348&r2=1.4349&f=h
http://html5.org/tools/web-apps-tracker?from=5453&to=5454

===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.4348
retrieving revision 1.4349
diff -u -d -r1.4348 -r1.4349
--- Overview.html	9 Sep 2010 01:49:26 -0000	1.4348
+++ Overview.html	9 Sep 2010 22:21:18 -0000	1.4349
@@ -31641,7 +31641,7 @@
 
    <p>The following extract shows how a messaging client's text entry
    could be arbitrarily restricted to a fixed number of characters,
-   thus forcing any conversion through this medium to be terse and
+   thus forcing any conversation through this medium to be terse and
    discouraging intelligent discourse.</p>
 
    <pre>What are you doing? &lt;input name=status maxlength=140&gt;</pre>