Update carbon-aware-cli.md

[JasonLuuk]

Fixes bugs with Linux scripts

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[danuw]

LGTM

[Willmish]

LGTM, the first \ occurance is crucial as it shows the difference between running the executable on Windows and UNIX based systems. I think its acceptable to change the rest as they don't have .exe extension and its straightforward enough to choose right format based on the beginning of the doc.

Thanks for the contribution @JasonLuuk , glad to see more PRs coming out of UCL 🚀