[refurb] Make example error out-of-the-box (FURB177) (#19309)

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## Summary

Part of #18972
This PR makes
[implicit-cwd(FURB177)](https://docs.astral.sh/ruff/rules/implicit-cwd/)'s
example error out-of-the-box.

[Old example](https://play.ruff.rs/a0bef229-9626-426f-867f-55cb95ee64d8)
```python
cwd = Path().resolve()
```
[New example](https://play.ruff.rs/bdbea4af-e276-4603-a1b6-88757dfaa399)
```python
from pathlib import Path

cwd = Path().resolve()
```
<!-- What's the purpose of the change? What does it do, and why? -->


## Test Plan

<!-- How was it tested? -->
N/A, no functionality/tests affected

crates/ruff_linter/src/rules/refurb/rules/implicit_cwd.rs

@@ -14,11 +14,15 @@ use crate::{checkers::ast::Checker, importer::ImportRequest};
 ///
 /// ## Example
 /// ```python
+/// from pathlib import Path
+///
 /// cwd = Path().resolve()
 /// ```
 ///
 /// Use instead:
 /// ```python
+/// from pathlib import Path
+///
 /// cwd = Path.cwd()
 /// ```
 ///