preparing 2.4.21 raised a too low limit rebuilt the docs Daniel

* configure.in include/libxml/xmlwin32version.h: preparing 2.4.21
* valid.c: raised a too low limit
* doc/*: rebuilt the docs
Daniel
diff --git a/doc/html/libxml-parser.html b/doc/html/libxml-parser.html
index 0406d31..19f1df1 100644
--- a/doc/html/libxml-parser.html
+++ b/doc/html/libxml-parser.html
@@ -8812,8 +8812,8 @@
 It use the given SAX function block to handle the parsing callback.
 If sax is NULL, fallback to the default DOM tree building routines.</P
 ><P
->User data (void *) is stored within the parser context, so it is
-available nearly everywhere in libxml.</P
+>User data (void *) is stored within the parser context in the
+context's _private member, so it is available nearly everywhere in libxml</P
 ><P
 ></P
 ><DIV