Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/compute_beta.zoneOperations.html b/docs/dyn/compute_beta.zoneOperations.html
index f049ccb..7de36ce 100644
--- a/docs/dyn/compute_beta.zoneOperations.html
+++ b/docs/dyn/compute_beta.zoneOperations.html
@@ -153,7 +153,7 @@
     },
     "endTime": "A String", # [Output Only] The time that this operation was completed. This value is in RFC3339 text format.
     "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
-    "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. If creating a persistent disk snapshot, this points to the persistent disk that the snapshot was created from.
+    "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. For operations related to creating a snapshot, this points to the persistent disk that the snapshot was created from.
   }</pre>
 </div>
 
@@ -230,7 +230,7 @@
         },
         "endTime": "A String", # [Output Only] The time that this operation was completed. This value is in RFC3339 text format.
         "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
-        "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. If creating a persistent disk snapshot, this points to the persistent disk that the snapshot was created from.
+        "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. For operations related to creating a snapshot, this points to the persistent disk that the snapshot was created from.
       },
     ],
     "kind": "compute#operationList", # [Output Only] Type of resource. Always compute#operations for Operations resource.