Auto merge of #3422 - hi-rustin:rustin-patch, r=JohnTitor

chore: add the missing arg to CONTRIBUTING docs

Author: bors

docs/CONTRIBUTING.md

@@ -555,7 +555,7 @@ Unlike a local setup, the Git index is not stored in the `./tmp` folder, so in
 order to publish to the Dockerized crates.io, run
 
 ```
-cargo publish --index http://localhost:4200/git/index
+cargo publish --index http://localhost:4200/git/index --token $YOUR_TOKEN
 ```
 
 #### Changing code