[`flake8-use-pathlib`] Make example error out-of-the-box (`PTH210`) (#19189)
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## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
Part of #18972
This PR makes [invalid-pathlib-with-suffix
(PTH210)](https://docs.astral.sh/ruff/rules/invalid-pathlib-with-suffix/#invalid-pathlib-with-suffix-pth210)'s
example error out-of-the-box.
[Old example](https://play.ruff.rs/d45720cc-fd08-4443-820f-b3bc9756ac59)
```py
path.with_suffix("py")
```
[New example](https://play.ruff.rs/4103669e-19c5-464a-a3fb-6e7d190ce5fd)
```py
from pathlib import Path
path = Path()
path.with_suffix("py")
```
The "Use instead" section was also modified similarly.
## Test Plan
<!-- How was it tested? -->
N/A, no functionality/tests affected
ruff
de5264fe - [`flake8-use-pathlib`] Make example error out-of-the-box (`PTH210`) (#19189)
