[refurb] Make example error out-of-the-box (FURB180) (#19672)

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## Summary

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

Part of #18972

This PR makes [meta-class-abc-meta
(FURB180)](https://docs.astral.sh/ruff/rules/meta-class-abc-meta/#meta-class-abc-meta-furb180)'s
example error out-of-the-box.

[Old example](https://play.ruff.rs/6beca1be-45cd-4e5a-aafa-6a0584c10d64)
```py
class C(metaclass=ABCMeta):
    pass
```

[New example](https://play.ruff.rs/bbad34da-bf07-44e6-9f34-53337e8f57d4)
```py
import abc


class C(metaclass=abc.ABCMeta):
    pass
```

The "Use instead" section as also modified similarly.

## Test Plan

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

N/A, no functionality/tests affected

Author: MeGaGiGaGon

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

@@ -22,13 +22,19 @@ use crate::{AlwaysFixableViolation, Edit, Fix};
 ///
 /// ## Example
 /// ```python
-/// class C(metaclass=ABCMeta):
+/// import abc
+///
+///
+/// class C(metaclass=abc.ABCMeta):
 ///     pass
 /// ```
 ///
 /// Use instead:
 /// ```python
-/// class C(ABC):
+/// import abc
+///
+///
+/// class C(abc.ABC):
 ///     pass
 /// ```
 ///