docs: add code fences to Example: docstring blocks (#2104)

src/mcp/client/experimental/task_handlers.py

@@ -187,11 +187,13 @@ class ExperimentalTaskHandlers:
     WARNING: These APIs are experimental and may change without notice.
 
     Example:
+        ```python
         handlers = ExperimentalTaskHandlers(
             get_task=my_get_task_handler,
             list_tasks=my_list_tasks_handler,
         )
         session = ClientSession(..., experimental_task_handlers=handlers)
+        ```
     """
 
     # Pure task request handlers

src/mcp/client/experimental/tasks.py

@@ -5,6 +5,7 @@ This module provides client methods for interacting with MCP tasks.
 WARNING: These APIs are experimental and may change without notice.
 
 Example:
+    ```python
     # Call a tool as a task
     result = await session.experimental.call_tool_as_task("tool_name", {"arg": "value"})
     task_id = result.task.task_id
@@ -21,6 +22,7 @@ Example:
 
     # Cancel a task
     await session.experimental.cancel_task(task_id)
+    ```
 """
 
 from collections.abc import AsyncIterator
@@ -72,6 +74,7 @@ class ExperimentalClientFeatures:
             CreateTaskResult containing the task reference
 
         Example:
+            ```python
             # Create task
             result = await session.experimental.call_tool_as_task(
                 "long_running_tool", {"input": "data"}
@@ -87,6 +90,7 @@ class ExperimentalClientFeatures:
 
             # Get result
             final = await session.experimental.get_task_result(task_id, CallToolResult)
+            ```
         """
         return await self._session.send_request(
             types.CallToolRequest(
@@ -189,6 +193,7 @@ class ExperimentalClientFeatures:
             GetTaskResult for each poll
 
         Example:
+            ```python
             async for status in session.experimental.poll_task(task_id):
                 print(f"Status: {status.status}")
                 if status.status == "input_required":
@@ -197,6 +202,7 @@ class ExperimentalClientFeatures:
 
             # Task is now terminal, get the result
             result = await session.experimental.get_task_result(task_id, CallToolResult)
+            ```
         """
         async for status in poll_until_terminal(self.get_task, task_id):
             yield status

src/mcp/client/session.py

@@ -206,8 +206,10 @@ class ClientSession(
             These APIs are experimental and may change without notice.
 
         Example:
+            ```python
             status = await session.experimental.get_task(task_id)
             result = await session.experimental.get_task_result(task_id, CallToolResult)
+            ```
         """
         if self._experimental_features is None:
             self._experimental_features = ExperimentalClientFeatures(self)

src/mcp/client/session_group.py

@@ -91,13 +91,14 @@ class ClientSessionGroup:
     For auxiliary handlers, such as resource subscription, this is delegated to
     the client and can be accessed via the session.
 
-    Example Usage:
+    Example:
+        ```python
         name_fn = lambda name, server_info: f"{(server_info.name)}_{name}"
         async with ClientSessionGroup(component_name_hook=name_fn) as group:
             for server_param in server_params:
                 await group.connect_to_server(server_param)
             ...
-
+        ```
     """
 
     class _ComponentNames(BaseModel):