docs: add snippet verification for docs/ pages (#2115)

examples/snippets/servers/prompt_change_notifications.py

@@ -0,0 +1,12 @@
+from mcp.server.fastmcp import Context, FastMCP
+from mcp.server.session import ServerSession
+
+mcp = FastMCP("Dynamic Prompts")
+
+
+@mcp.tool()
+async def update_prompts(ctx: Context[ServerSession, None]) -> str:
+    """Update available prompts and notify clients."""
+    # ... modify prompts ...
+    await ctx.session.send_prompt_list_changed()
+    return "Prompts updated"