small grammar fix

Co-authored-by: Maxim <17935127+delatrie@users.noreply.github.com>

allure-pytest/examples/display_name/display_name.rst

@@ -18,7 +18,7 @@ Titles support placeholders for arguments.
     ... def test_display_name_template(param):
     ...     assert param
 
-    >>> @allure.title("A some test title with ParameterSet id {param_id}")
+    >>> @allure.title("A test title with ParameterSet id {param_id}")
     ... @pytest.mark.parametrize('param', [False], ids=["some_id"])
     ... def test_display_name_parameter_set_id(param):
     ...     assert param