Remove the htmllib and sgmllib modules as per PEP 3108.
diff --git a/Lib/_markupbase.py b/Lib/_markupbase.py
index b178470..adf6ba2 100644
--- a/Lib/_markupbase.py
+++ b/Lib/_markupbase.py
@@ -1,8 +1,7 @@
"""Shared support for scanning document type declarations in HTML and XHTML.
-This module is used as a foundation for the HTMLParser and sgmllib
-modules (indirectly, for htmllib as well). It has no documented
-public API and should not be used directly.
+This module is used as a foundation for the html.parser module. It has no
+documented public API and should not be used directly.
"""