Python generator bug raised by the const change

the doc methode for xmlDocGetRootElement wasn't generated anymore
diff --git a/python/generator.py b/python/generator.py
index 82109e3..c0cb3ad 100755
--- a/python/generator.py
+++ b/python/generator.py
@@ -597,7 +597,7 @@
     "xmlNodePtr": ("._o", "xmlNode(_obj=%s)", "xmlNode"),
     "xmlNode *": ("._o", "xmlNode(_obj=%s)", "xmlNode"),
     "xmlDocPtr": ("._o", "xmlDoc(_obj=%s)", "xmlDoc"),
-    "xmlDocPtr *": ("._o", "xmlDoc(_obj=%s)", "xmlDoc"),
+    "xmlDoc *": ("._o", "xmlDoc(_obj=%s)", "xmlDoc"),
     "htmlDocPtr": ("._o", "xmlDoc(_obj=%s)", "xmlDoc"),
     "htmlxmlDocPtr *": ("._o", "xmlDoc(_obj=%s)", "xmlDoc"),
     "xmlAttrPtr": ("._o", "xmlAttr(_obj=%s)", "xmlAttr"),