doc: Remove empty lines at start of block

These lines were left over after automatic conversion.

include/libxml/xmlautomata.h

@@ -24,14 +24,12 @@ extern "C" {
 #endif
 
 /**
- *
  * A libxml automata description, It can be compiled into a regexp
  */
 typedef struct _xmlAutomata xmlAutomata;
 typedef xmlAutomata *xmlAutomataPtr;
 
 /**
- *
  * A state int the automata description,
  */
 typedef struct _xmlAutomataState xmlAutomataState;