message: use cargo-install to install josh-proxy
diff: @@ -233,14 +233,14 @@ You can also directly run Miri on a Rust source file:
  ## Advanced topic: Syncing with the rustc repo
  We use the [`josh` proxy](https://github.com/josh-project/josh) to transmit changes between the
  -rustc and Miri repositories. The eaisest way to run josh is via docker:
  +rustc and Miri repositories.
  ```sh
  -docker pull joshproject/josh-proxy:latest
  -docker run -it -p 8000:8000 -e JOSH_REMOTE=https://github.com -e JOSH_EXTRA_OPTS=--no-background -v josh-vol:/data/git joshproject/josh-proxy:latest
  +cargo +stable install josh-proxy --git https://github.com/josh-project/josh --tag r22.12.06
  +josh-proxy --local=$HOME/.cache/josh --remote=https://github.com --no-background
  ```
  -This sets up a local volume `josh-vol` for josh's cache.
  +This uses a directory `$HOME/.cache/josh` as a cache, to speed up repeated pulling/pushing.
  ### Importing changes from the rustc repo
  