docs: Added behavior ref to instance_warmup_period arg desc for aws_e…

…cs_capacity_provider

website/docs/r/ecs_capacity_provider.html.markdown

@@ -60,6 +60,8 @@ This resource supports the following arguments:
 ### `managed_scaling`
 
 * `instance_warmup_period` - (Optional) Period of time, in seconds, after a newly launched Amazon EC2 instance can contribute to CloudWatch metrics for Auto Scaling group. If this parameter is omitted, the default value of 300 seconds is used.
+
+  For more information on how the instance warmup period contributes to managed scale-out behavior, see [Control the instances Amazon ECS terminates](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/managed-termination-protection.html) in the _Amazon Elastic Container Service Developer Guide_.
 * `maximum_scaling_step_size` - (Optional) Maximum step adjustment size. A number between 1 and 10,000.
 * `minimum_scaling_step_size` - (Optional) Minimum step adjustment size. A number between 1 and 10,000.
 * `status` - (Optional) Whether auto scaling is managed by ECS. Valid values are `ENABLED` and `DISABLED`.