preparing 2.4.6 release updated and rebuilt the docs fixed a number of

* configure.in: preparing 2.4.6 release
* doc/xml.html doc/html/*: updated and rebuilt the docs
* include/libxml/*.h *.c: fixed a number of teh/the widht/width typos
Daniel
diff --git a/encoding.c b/encoding.c
index 8237450..781d8da 100644
--- a/encoding.c
+++ b/encoding.c
@@ -86,7 +86,7 @@
  * xmlUTF8Strlen:
  * @utf:  a sequence of UTF-8 encoded bytes
  *
- * compute the lenght of an UTF8 string, it doesn't do a full UTF8
+ * compute the length of an UTF8 string, it doesn't do a full UTF8
  * checking of the content of the string.
  *
  * Returns the number of characters in the string or -1 in case of error