Document the `lsp.rust-analyzer.binary.arguments` setting (currently
incorrectly referred to as `args`)

Verify:
https://github.com/zed-industries/zed/blob/99215f7660a722461792e49cb920bfda5c801286/crates/extension_api/wit/since_v0.1.0/settings.rs#L24-L29

Question: can such inconsistencies be avoided by automatically
documenting the config using a preprocessor?

Release Notes:

- N/A