fixing some comments to avoid warnings from apibuild.py Daniel

* SAX2.c hash.c parser.c include/libxml/xmlexports.h
  include/libxml/xmlmemory.h include/libxml/xmlversion.h.in:
  fixing some comments to avoid warnings from apibuild.py
Daniel
diff --git a/xmlreader.c b/xmlreader.c
index 4c02a03..9150932 100644
--- a/xmlreader.c
+++ b/xmlreader.c
@@ -2968,7 +2968,7 @@
 }
 
 /**
- * xmlTextReaderXmlLang:
+ * xmlTextReaderConstXmlLang:
  * @reader:  the xmlTextReaderPtr used
  *
  * The xml:lang scope within which the node resides.