Merge pull request #8939 from hashicorp/aws-elasticache-cluster-address

docs/aws: Adding `cluster_address` as an exported parameter for the `aws_elasticache_cluster` resource

website/source/docs/providers/aws/r/elasticache_cluster.html.markdown

@@ -117,7 +117,8 @@ The following attributes are exported:
 * `cache_nodes` - List of node objects including `id`, `address`, `port` and `availability_zone`.
    Referenceable e.g. as `${aws_elasticache_cluster.bar.cache_nodes.0.address}`
 
-* `configuration_endpoint` - (Memcached only) The configuration endpoint to allow host discovery
+* `configuration_endpoint` - (Memcached only) The configuration endpoint to allow host discovery.
+* `cluster_address` - (Memcached only) The DNS name of the cache cluster without the port appended.
 
 [1]: https://docs.aws.amazon.com/AmazonElastiCache/latest/APIReference/API_ModifyCacheCluster.html
 [2]: https://docs.aws.amazon.com/fr_fr/AmazonElastiCache/latest/UserGuide/Clusters.Modify.html