grammar mistake in Copilot with neovim setup article

[ivyrs]

Code of Conduct

• 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?

remove the erroneous "a" in "If you use a Neovim, you can view..."

Additional information

No response

[cmwilson21]

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