Update comments to reflect single successful return type

tinyxml2.h

@@ -1129,7 +1129,7 @@ public:
     }
 
     /** QueryIntValue interprets the attribute as an integer, and returns the value
-    	in the provided parameter. The function will return XML_NO_ERROR on success,
+    	in the provided parameter. The function will return XML_SUCCESS on success,
     	and XML_WRONG_ATTRIBUTE_TYPE if the conversion is not successful.
     */
     XMLError QueryIntValue( int* value ) const;
@@ -1273,7 +1273,7 @@ public:
     }
 
     /** Given an attribute name, QueryIntAttribute() returns
-    	XML_NO_ERROR, XML_WRONG_ATTRIBUTE_TYPE if the conversion
+    	XML_SUCCESS, XML_WRONG_ATTRIBUTE_TYPE if the conversion
     	can't be performed, or XML_NO_ATTRIBUTE if the attribute
     	doesn't exist. If successful, the result of the conversion
     	will be written to 'value'. If not successful, nothing will
@@ -1338,7 +1338,7 @@ public:
 
 	
     /** Given an attribute name, QueryAttribute() returns
-    	XML_NO_ERROR, XML_WRONG_ATTRIBUTE_TYPE if the conversion
+    	XML_SUCCESS, XML_WRONG_ATTRIBUTE_TYPE if the conversion
     	can't be performed, or XML_NO_ATTRIBUTE if the attribute
     	doesn't exist. It is overloaded for the primitive types,
 		and is a generally more convenient replacement of
@@ -1612,7 +1612,7 @@ public:
 
     /**
     	Parse an XML file from a character string.
-    	Returns XML_NO_ERROR (0) on success, or
+    	Returns XML_SUCCESS (0) on success, or
     	an errorID.
 
     	You may optionally pass in the 'nBytes', which is
@@ -1624,7 +1624,7 @@ public:
 
     /**
     	Load an XML file from disk.
-    	Returns XML_NO_ERROR (0) on success, or
+    	Returns XML_SUCCESS (0) on success, or
     	an errorID.
     */
     XMLError LoadFile( const char* filename );
@@ -1637,14 +1637,14 @@ public:
         not text in order for TinyXML-2 to correctly
         do newline normalization.
 
-    	Returns XML_NO_ERROR (0) on success, or
+    	Returns XML_SUCCESS (0) on success, or
     	an errorID.
     */
     XMLError LoadFile( FILE* );
 
     /**
     	Save the XML file to disk.
-    	Returns XML_NO_ERROR (0) on success, or
+    	Returns XML_SUCCESS (0) on success, or
     	an errorID.
     */
     XMLError SaveFile( const char* filename, bool compact = false );
@@ -1653,7 +1653,7 @@ public:
     	Save the XML file to disk. You are responsible
     	for providing and closing the FILE*.
 
-    	Returns XML_NO_ERROR (0) on success, or
+    	Returns XML_SUCCESS (0) on success, or
     	an errorID.
     */
     XMLError SaveFile( FILE* fp, bool compact = false );