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

docs_src/caching/tutorial002.py

@@ -7,6 +7,7 @@ TOOLS = [Tool(name="forecast", input_schema={"type": "object"})]
 
 
 async def list_tools(ctx: ServerRequestContext[Any], params: PaginatedRequestParams | None) -> ListToolsResult:
+    print("tools/list served")
     return ListToolsResult(tools=TOOLS, ttl_ms=1_000)
 
 
@@ -15,3 +16,4 @@ server = Server(
     on_list_tools=list_tools,
     cache_hints={"tools/list": CacheHint(ttl_ms=60_000, scope="public")},
 )
+app = server.streamable_http_app()