Ansible: Backend Bucket fixes (hashicorp#1418)

Author: modular-magician

docs/r/compute_backend_bucket.html.markdown

@@ -25,7 +25,7 @@ description: |-
 Backend buckets allow you to use Google Cloud Storage buckets with HTTP(S)
 load balancing.
 
-An HTTP(S) load balancing can direct traffic to specified URLs to a
+An HTTP(S) load balancer can direct traffic to specified URLs to a
 backend bucket rather than a backend service. It can send requests for
 static content to a Cloud Storage bucket and requests for dynamic content
 a virtual machine instance.