hixie: year zero isn't allowed, so it should talk about year one (whatwg r4317)

hixie: year zero isn't allowed, so it should talk about year one (whatwg
r4317)

http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.3452&r2=1.3453&f=h
http://html5.org/tools/web-apps-tracker?from=4316&to=4317

===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.3452
retrieving revision 1.3453
diff -u -d -r1.3452 -r1.3453
--- Overview.html	24 Oct 2009 22:43:23 -0000	1.3452
+++ Overview.html	24 Oct 2009 22:44:54 -0000	1.3453
@@ -3531,7 +3531,7 @@
 
     <li>The time and time-zone offset components are not optional.</li>
 
-    <li>Dates before the year zero can't be represented as a datetime
+    <li>Dates before the year one can't be represented as a datetime
     in this version of HTML.</li>
 
     <li>Time-zone offsets differ based on daylight savings time.</li>