avoid Class/Interface names in callout; instead refer to the SDK's interface members

Author: sid-rl

README-SDK.md

@@ -356,7 +356,7 @@ devbox.await_suspended()
 devbox.shutdown()
 ```
 
-> **State-waiting behavior:** In the synchronous SDK, `DevboxOps.from_id()` and `Devbox.resume()` block until the devbox reaches the `running` state, and `Devbox.suspend()` blocks until the devbox is `suspended`. The async counterparts (`AsyncDevboxOps.from_id()`, `AsyncDevbox.resume()`, `AsyncDevbox.suspend()`) return immediately; call `await_running()` / `await_suspended()` explicitly if you need to wait for the state transition.
+> **State-waiting behavior:** In the synchronous SDK, `runloop.devbox.from_id()` and `devbox.resume()` block until the devbox reaches the `running` state, and `devbox.suspend()` blocks until the devbox is `suspended`. The async counterparts return immediately; call `await_running()` / `await_suspended()` explicitly if you need to wait for the state transition.
 
 #### Context Manager Support