Value::find(): Fix assert message

Author: res2k

src/lib_json/json_value.cpp

@@ -1115,7 +1115,7 @@ bool Value::isValidIndex(ArrayIndex index) const { return index < size(); }
 
 Value const* Value::find(char const* begin, char const* end) const {
   JSON_ASSERT_MESSAGE(type() == nullValue || type() == objectValue,
-                      "in Json::Value::find(key, end, found): requires "
+                      "in Json::Value::find(begin, end): requires "
                       "objectValue or nullValue");
   if (type() == nullValue)
     return nullptr;