fix: correct usage issues and docs for neovim

[tembleking]

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[Copilot]

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

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src/main.rs:19

• Verify that std::io::stderr is used correctly. If with_writer expects an instance of a writer, consider using std::io::stderr() instead of passing the function pointer.

.with(tracing_subscriber::fmt::layer().with_writer(std::io::stderr));

[Jujuyeh]

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