Document the minimum Neovim version for Copilot.

[Kixunil]

Code of Conduct

• [X] I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/copilot/getting-started-with-github-copilot/getting-started-with-github-copilot-in-neovim

What part(s) of the article would you like to see updated?

Knowing the minimum version of Neovim can avoid wasted time on surprising "Vim version too old" message. Just add simple version number to Prerequisites section so that people can see it immediately instead of digging into the code.

Additional information

No response

[welcome[bot]]

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[cmwilson21]

@Kixunil Thank you for opening an issue and linking it to your PR! ✨