DOCS: Add info about how ruff is used.

## 📚 Documentation


Add info about how ruff is used to the documentation.

Perhaps in the [CI Testing](https://scitools-iris.readthedocs.io/en/latest/developers_guide/contributing_ci_tests.html) section?

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DOCS: Add info about how ruff is used. #5688

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DOCS: Add info about how ruff is used. #5688

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📚 Documentation

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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