docs: stop presenting the in-memory client as the way to connect (#3443)

examples/stories/prompts/README.md

@@ -21,8 +21,9 @@ uv run python -m stories.prompts.client --http --server server_lowlevel
 ## What to look at
 
 - `client.py` `main` — the body opens with `async with Client(target,
-  mode=mode) as client:`; `target` is anything `Client(...)` accepts (an
-  in-process server, a `Transport`, or an HTTP URL).
+  mode=mode) as client:`; `target` is anything `Client(...)` accepts (an HTTP
+  URL, `StdioServerParameters`, a `Transport`, or, in tests, an in-process
+  server).
 - `server.py` `greet` vs `code_review` — return a bare `str` (wrapped as one
   user message) or a `list[Message]` for a multi-turn seed conversation.
 - `server.py` `complete()` — one global handler dispatches on `ref` +