Fix CLI example in top level API docs
`neon init neon` -> `npm init neon` in main lib API docs
//! # }
//! ```
//!
-//! The example code generated by `neon init neon` exports a single
+//! The example code generated by `npm init neon` exports a single
//! function via [`ModuleContext::export_function`](context::ModuleContext::export_function).
//! The `hello` function is defined just above `main` in `src/lib.rs`:
//!
