docs(methods): align agents.sessions README descriptions with the API reference

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: zimeg

methods/README.md

@@ -19,7 +19,7 @@ $ slack run chat_post_message  # Make the request
 ### agents.sessions
 
 - **[agents.sessions.rename](https://docs.slack.dev/reference/methods/agents.sessions.rename)**: Renames an agent session. [Implementation](./src/agents_sessions/agents_sessions_rename.py).
-- **[agents.sessions.setStatus](https://docs.slack.dev/reference/methods/agents.sessions.setStatus)**: Sets an agent session's lifecycle status, creating the session if needed. [Implementation](./src/agents_sessions/agents_sessions_set_status.py).
+- **[agents.sessions.setStatus](https://docs.slack.dev/reference/methods/agents.sessions.setStatus)**: Sets the lifecycle status of an agent session, creating the session if it does not already exist. [Implementation](./src/agents_sessions/agents_sessions_set_status.py).
 
 ### chat