Fix wording on HA doc (client -> host) (#803)

website/content/docs/installing/high-availability.mdx

@@ -33,7 +33,7 @@ needs:
 As shown above, Boundary is broken up into its controller and worker server components across 3 [EC2 instances](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/instance), in
 3 separate [subnets](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/subnet), in three separate [availability zones](), with the controller API and UI being publically exposed by an [application load balancer (ALB)](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb). The worker and controller VM's are in independant [auto-scaling groups](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/autoscaling_group), allowing them to maintain their exact capacity.
 
-The workers must be able to establish a connection to clients which they interact. In the architecture above, we place them in the public subnet so our remote client can establish a session between them and the target VM.
+The workers must be able to establish a connection to the hosts with which they interact. In the architecture above, we place them in the public subnet so our remote client can establish a session between them and the target VM.
 
 Boundary requires an external [Postgres](https://www.postgresql.org/) and [KMS](https://aws.amazon.com/kms/). In the example above, we're using AWS managed services for these components. For Postgres, we're using [RDS](https://aws.amazon.com/rds/) and for KMS we're using Amazon's [Key Management Service](https://aws.amazon.com/kms/).