Update completion type enum to reflect changes in grpc.h

src/csharp/GrpcCore/Internal/Enums.cs

@@ -36,29 +36,36 @@ namespace Google.GRPC.Core.Internal
     /// </summary>
     internal enum GRPCCompletionType
     {
-        GRPC_QUEUE_SHUTDOWN,
         /* Shutting down */
-        GRPC_READ,
+        GRPC_QUEUE_SHUTDOWN,
+
+        /* operation completion */
+        GRPC_OP_COMPLETE,  
+
         /* A read has completed */
-        GRPC_INVOKE_ACCEPTED,
-        /* An invoke call has been accepted by flow
-                                control */
+        GRPC_READ,
+
+        /* A write has been accepted by flow control */
         GRPC_WRITE_ACCEPTED,
-        /* A write has been accepted by
-                                flow control */
-        GRPC_FINISH_ACCEPTED,
+
         /* writes_done or write_status has been accepted */
+        GRPC_FINISH_ACCEPTED,
+
+        /* The metadata array sent by server received at client */
         GRPC_CLIENT_METADATA_READ,
-        /* The metadata array sent by server received at
-                                client */
+
+        /* An RPC has finished. The event contains status. 
+         * On the server this will be OK or Cancelled. */
         GRPC_FINISHED,
-        /* An RPC has finished. The event contains status.
-                                On the server this will be OK or Cancelled. */
-        GRPC_SERVER_RPC_NEW,
+
         /* A new RPC has arrived at the server */
+        GRPC_SERVER_RPC_NEW,
+
+        /* The server has finished shutting down */
+        GRPC_SERVER_SHUTDOWN,
+
+        /* must be last, forces users to include a default: case */
         GRPC_COMPLETION_DO_NOT_USE
-        /* must be last, forces users to include
-                                a default: case */
     }
 
     /// <summary>