Update docs to reflect set-track command (#474)

Author: bryanoltman

src/content/docs/code-push/guides/staging-patches.mdx

@@ -159,7 +159,7 @@ appears.
 You can promote the patch to the stable channel using the following command:
 
 ```sh
-shorebird patches promote --release-version 1.0.0+1 --patch-number 1
+shorebird patches set-track --release-version 1.0.0+1 --patch-number 1 --track stable
 ```
 
 </details>