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

examples/snippets/servers/set_logging_level.py

@@ -0,0 +1,13 @@
+import mcp.types as types
+from mcp.server.lowlevel import Server
+
+server = Server("Logging Level Example")
+
+current_level: types.LoggingLevel = "warning"
+
+
+@server.set_logging_level()
+async def handle_set_level(level: types.LoggingLevel) -> None:
+    """Handle client request to change the logging level."""
+    global current_level
+    current_level = level