Update sampleec2.tf

sampleec2.tf

@@ -23,7 +23,7 @@ resource "aws_ebs_volume" "vol" {
               tags = { key_name = "ec2instance" }
 }
 resource "time_sleep" "wait_30_seconds" {
-  depends_on = [aws_instance.ec301]
+  depends_on = "[aws_instance.ec301]"
 
   create_duration = "60s"
 }