message: fix: remove install command `$`, for copying friendly
diff: @@ -8,7 +8,7 @@ by using `rustup`. Installing Rust using `rustup` will also install `cargo`.
  On Linux and macOS systems, this is done as follows:
  ```console
  -$ curl https://sh.rustup.rs -sSf | sh
  +curl https://sh.rustup.rs -sSf | sh
  ```
  It will download a script, and start the installation. If everything goes well,
  