Fixed missing curly brace for variable in the docs (comparing-ai-models-using-diff…)

[mjalwajeeh-personal]

A simple GitHub documentation update to fix a malformed dynamic variable.

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

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Source	Review	Production	What Changed
copilot/using-github-copilot/ai-models/comparing-ai-models-using-different-tasks.md	fpt ghec	fpt ghec

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[Sharra-writes]

Thanks for spotting this and opening a PR! I'll get it reviewed and merged momentarily. 💛

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