fix(docs): sleep status descriptions

Author: jamescmartinez

packages/docs/docs/sleeping.mdx

@@ -48,7 +48,8 @@ export const reminderWorkflow = defineWorkflow(
 When a workflow encounters `step.sleep()`:
 
 1. A step attempt is created with the resume time
-2. The workflow status changes to `sleeping`
+2. The workflow is durably parked in `running` with `workerId = null` and
+   `availableAt` set to the resume time
 3. The worker releases the workflow (frees the slot)
 4. When the sleep duration elapses, the workflow becomes available again
 5. A worker claims it and resumes from after the sleep

packages/docs/docs/workflows.mdx

@@ -236,14 +236,13 @@ defineWorkflow({ name: "example" }, async ({ input, step, version, run }) => {
 
 A workflow run progresses through these states:
 
-| Status      | Description                                                    |
-| ----------- | -------------------------------------------------------------- |
-| `pending`   | Created and waiting for a worker to claim it                   |
-| `running`   | Actively being executed by a worker                            |
-| `sleeping`  | Paused while waiting for `step.sleep` or `step.runWorkflow`    |
-| `completed` | Finished successfully                                          |
-| `failed`    | Failed after exhausting retries, hitting deadline, or step cap |
-| `canceled`  | Explicitly canceled and will not continue                      |
+| Status      | Description                                                                      |
+| ----------- | -------------------------------------------------------------------------------- |
+| `pending`   | Created and waiting for a worker to claim it                                     |
+| `running`   | Actively executing, or durably parked with `workerId = null` until `availableAt` |
+| `completed` | Finished successfully                                                            |
+| `failed`    | Failed after exhausting retries, hitting deadline, or step cap                   |
+| `canceled`  | Explicitly canceled and will not continue                                        |
 
 ## Determinism