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
diff --git a/doc/html/libxml-tree.html b/doc/html/libxml-tree.html
index e6fad46..26f5ddf 100644
--- a/doc/html/libxml-tree.html
+++ b/doc/html/libxml-tree.html
@@ -1025,7 +1025,7 @@
 >  <A
 HREF="libxml-tree.html#XMLDOCCOPYNODE"
 >xmlDocCopyNode</A
->                  (<A
+>                  (const <A
 HREF="libxml-tree.html#XMLNODEPTR"
 >xmlNodePtr</A
 > node,
@@ -1040,7 +1040,7 @@
 >  <A
 HREF="libxml-tree.html#XMLCOPYNODELIST"
 >xmlCopyNodeList</A
->                 (<A
+>                 (const <A
 HREF="libxml-tree.html#XMLNODEPTR"
 >xmlNodePtr</A
 > node);
@@ -9423,7 +9423,7 @@
 ><A
 HREF="libxml-tree.html#XMLNODEPTR"
 >xmlNodePtr</A
->  xmlDocCopyNode                  (<A
+>  xmlDocCopyNode                  (const <A
 HREF="libxml-tree.html#XMLNODEPTR"
 >xmlNodePtr</A
 > node,
@@ -9551,7 +9551,7 @@
 ><A
 HREF="libxml-tree.html#XMLNODEPTR"
 >xmlNodePtr</A
->  xmlCopyNodeList                 (<A
+>  xmlCopyNodeList                 (const <A
 HREF="libxml-tree.html#XMLNODEPTR"
 >xmlNodePtr</A
 > node);</PRE