Heiko W. Rupp fixed a lot of comments to generate better API descriptions

* include/libxml/*.h: Heiko W. Rupp fixed a lot of comments
  to generate better API descriptions etc...
Daniel
diff --git a/include/libxml/HTMLtree.h b/include/libxml/HTMLtree.h
index e17a414..ada80fb 100644
--- a/include/libxml/HTMLtree.h
+++ b/include/libxml/HTMLtree.h
@@ -22,35 +22,35 @@
 /**
  * HTML_TEXT_NODE:
  *
- * Macro, a text node in a HTML document is really implemented
+ * Macro. A text node in a HTML document is really implemented
  * the same way as a text node in an XML document.
  */
 #define HTML_TEXT_NODE		XML_TEXT_NODE
 /**
  * HTML_ENTITY_REF_NODE:
  *
- * Macro, an entity reference in a HTML document is really implemented
+ * Macro. An entity reference in a HTML document is really implemented
  * the same way as an entity reference in an XML document.
  */
 #define HTML_ENTITY_REF_NODE	XML_ENTITY_REF_NODE
 /**
  * HTML_COMMENT_NODE:
  *
- * Macro, a comment in a HTML document is really implemented
+ * Macro. A comment in a HTML document is really implemented
  * the same way as a comment in an XML document.
  */
 #define HTML_COMMENT_NODE	XML_COMMENT_NODE
 /**
  * HTML_PRESERVE_NODE:
  *
- * Macro, a preserved node in a HTML document is really implemented
+ * Macro. A preserved node in a HTML document is really implemented
  * the same way as a CDATA section in an XML document.
  */
 #define HTML_PRESERVE_NODE	XML_CDATA_SECTION_NODE
 /**
  * HTML_PI_NODE:
  *
- * Macro, a processing instruction in a HTML document is really implemented
+ * Macro. A processing instruction in a HTML document is really implemented
  * the same way as a processing instruction in an XML document.
  */
 #define HTML_PI_NODE		XML_PI_NODE