reporter returns walk_result

doc/ref/jsonschema/json_schema/validate.md

@@ -42,8 +42,10 @@ to a [json_visitor](../../corelib/basic_json_visitor.md).
  <td>reporter</td>
  <td>A function object with signature equivalent to 
  <pre>
- void fun(const validation_message& msg)</pre>
-which accepts an argument of type <a href="../validation_message.md">validation_message</a>.</td> 
+ walk_result fun(const validation_message& msg)</pre>
+which accepts an argument of type <a href="../validation_message.md">validation_message</a> and
+returns a <a href="../walk_result.md">walk_result</a>.
+</td> 
  </tr>
  <tr>
  <td>patch</td>