docs: remove developer preview note from GGV2 client (#287)

Author: MikeDombo

sdk/greengrass/greengrass-client/src/event-stream-rpc-java/client/software/amazon/awssdk/aws/greengrass/GreengrassCoreIPCClientV2.java

@@ -82,9 +82,6 @@
 
 /**
  * V2 Client for Greengrass.
- * !! Developer Preview !! - This class is currently in developer preview.
- * The interface is not guaranteed to be stable yet.
- * Please report any issues or make suggestions in https://github.com/aws/aws-iot-device-sdk-java-v2/issues
  */
 public class GreengrassCoreIPCClientV2 implements AutoCloseable {
   protected GreengrassCoreIPC client;