Update the webpage (#2334)

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

06.REFERENCE-COUNTING.md

@@ -71,7 +71,7 @@ behaviour through property getting and setting.
    * prop_value contains a live reference to an error object.
    * This reference must be released as well. */
 
-  if (jerry_value_has_error_flag (prop_value))
+  if (jerry_value_is_error (prop_value))
   {
     /* Errors can be handled here. */
   }
@@ -103,7 +103,7 @@ behaviour through property getting and setting.
   /* The reference stored in the 'result' variable is live whether
    * the operation is successful or not, and must also be freed. */
 
-  if (jerry_value_has_error_flag (result))
+  if (jerry_value_is_error (result))
   {
     /* Errors can be handled here. */
   }