Add xmllib; remove (slow) from description of htmllib.
diff --git a/Doc/libwww.tex b/Doc/libwww.tex
index 2558e94..bf494bc 100644
--- a/Doc/libwww.tex
+++ b/Doc/libwww.tex
@@ -40,7 +40,10 @@
 --- Only as much of an SGML parser as needed to parse HTML.
 
 \item[htmllib]
---- A (slow) parser for HTML documents.
+--- A parser for HTML documents.
+
+\item[xmllib]
+--- A parser for XML documents.
 
 \item[formatter]
 --- Generic output formatter and device interface.