docs: update minimal MultiAgentRouter example and documentation to use SwarmRouter interface

docs/swarms/examples/multi_agent_router_minimal.md

@@ -1,9 +1,10 @@
 # MultiAgentRouter Minimal Example
 
-This example shows how to route a task to the most suitable agent using `MultiAgentRouter`.
+This example shows how to route a task to the most suitable agent using `SwarmRouter` with `swarm_type="MultiAgentRouter"`.
 
 ```python
-from swarms import Agent, MultiAgentRouter
+from swarms import Agent
+from swarms.structs.swarm_router import SwarmRouter
 
 agents = [
     Agent(
@@ -18,9 +19,15 @@ agents = [
     ),
 ]
 
-router = MultiAgentRouter(agents=agents)
+router = SwarmRouter(
+    name="multi-agent-router-demo",
+    description="Routes tasks to the most suitable agent",
+    agents=agents,
+    swarm_type="MultiAgentRouter"
+)
 
-result = router.route_task("Write a function that adds two numbers")
+result = router.run("Write a function that adds two numbers")
+print(result)
 ```
 
-View the source on [GitHub](https://github.com/kyegomez/swarms/blob/master/examples/multi_agent/mar/multi_agent_router_minimal.py).
+View the source on [GitHub](https://github.com/kyegomez/swarms/blob/master/examples/multi_agent/mar/multi_agent_router_minimal.py).