Update doc regarding pytest.raises (#5834)

Update doc regarding pytest.raises

Author: nicoddemus

doc/en/reference.rst

@@ -59,7 +59,7 @@ pytest.raises
 
 **Tutorial**: :ref:`assertraises`.
 
-.. autofunction:: pytest.raises(expected_exception: Exception, [match], [message])
+.. autofunction:: pytest.raises(expected_exception: Exception, [match])
     :with: excinfo
 
 pytest.deprecated_call