[flake8-pytest-style] Make example error out-of-the-box (PT023) (#19104)

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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->

Part of #18972

This PR makes [pytest-incorrect-mark-parentheses-style
(PT023)](https://docs.astral.sh/ruff/rules/pytest-incorrect-mark-parentheses-style/#pytest-incorrect-mark-parentheses-style-pt023)'s
example error out-of-the-box

[Old example](https://play.ruff.rs/48989153-6d4a-493a-a287-07f330f270bc)
```py
import pytest


@pytest.mark.foo
def test_something(): ...
```

[New example](https://play.ruff.rs/741f4d19-4607-4777-a77e-4ea6c62845e1)
```py
import pytest


@pytest.mark.foo()
def test_something(): ...
```

This just swaps the parenthesis in the "Example" and "Use instead"
sections since the default configuration is no parenthesis

## Test Plan

<!-- How was it tested? -->

N/A, no functionality/tests affected

Author: MeGaGiGaGon

crates/ruff_linter/src/rules/flake8_pytest_style/rules/marks.rs

@@ -31,7 +31,7 @@ use crate::rules::flake8_pytest_style::helpers::{Parentheses, get_mark_decorator
 /// import pytest
 ///
 ///
-/// @pytest.mark.foo
+/// @pytest.mark.foo()
 /// def test_something(): ...
 /// ```
 ///
@@ -41,7 +41,7 @@ use crate::rules::flake8_pytest_style::helpers::{Parentheses, get_mark_decorator
 /// import pytest
 ///
 ///
-/// @pytest.mark.foo()
+/// @pytest.mark.foo
 /// def test_something(): ...
 /// ```
 ///