Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/compute_v1.globalOperations.html b/docs/dyn/compute_v1.globalOperations.html
index eaa759b..2a6bca8 100644
--- a/docs/dyn/compute_v1.globalOperations.html
+++ b/docs/dyn/compute_v1.globalOperations.html
@@ -167,7 +167,7 @@
             },
             "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.
           },
         ],
         "warning": { # [Output Only] Informational warning which replaces the list of operations when the list is empty.
@@ -267,7 +267,7 @@
     },
     "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>
 
@@ -343,7 +343,7 @@
         },
         "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.