Fix broken link in actors example README (dapr#271)

Author: mkash32

examples/src/main/java/io/dapr/examples/actors/http/README.md

@@ -2,7 +2,7 @@
 
 In this example, we'll use Dapr to test the actor pattern capabilities such as concurrency, state, life-cycle management for actor activation/deactivation and timers and reminders to wake-up actors.
 
-Visit [this](https://github.com/dapr/docs/blob/master/concepts/actor/actor_overview.md) link for more information about the Actor pattern.
+Visit [this](https://github.com/dapr/docs/blob/master/concepts/actors/README.md) link for more information about the Actor pattern.
 
 This example contains the follow classes:
 
@@ -206,4 +206,4 @@ For more details on Dapr SpringBoot integration, please refer to [Dapr Spring Bo
 
 Currently, these are the limitations in the Java SDK for Dapr:
 * Actor interface cannot have overloaded methods (methods with same name but different signature).
-* Actor methods can only have zero or one parameter.
+* Actor methods can only have zero or one parameter.