Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/compute_alpha.healthChecks.html b/docs/dyn/compute_alpha.healthChecks.html
index 221e16d..708bd9c 100644
--- a/docs/dyn/compute_alpha.healthChecks.html
+++ b/docs/dyn/compute_alpha.healthChecks.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>
 
@@ -178,7 +178,7 @@
       },
       "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
       "timeoutSec": 42, # How long (in seconds) to wait before claiming failure. The default value is 5 seconds. It is invalid for timeoutSec to have greater value than checkIntervalSec.
-      "type": "A String", # Specifies the type of the healthCheck, either TCP, UDP, SSL, HTTP, HTTPS or HTTP2. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
+      "type": "A String", # Specifies the type of the healthCheck, either TCP, SSL, HTTP or HTTPS. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
       "checkIntervalSec": 42, # How often (in seconds) to send a health check. The default value is 5 seconds.
       "tcpHealthCheck": {
         "portName": "A String", # Port name as defined in InstanceGroup#NamedPort#name. If both port and port_name are defined, port takes precedence.
@@ -246,7 +246,7 @@
     },
     "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
     "timeoutSec": 42, # How long (in seconds) to wait before claiming failure. The default value is 5 seconds. It is invalid for timeoutSec to have greater value than checkIntervalSec.
-    "type": "A String", # Specifies the type of the healthCheck, either TCP, UDP, SSL, HTTP, HTTPS or HTTP2. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
+    "type": "A String", # Specifies the type of the healthCheck, either TCP, SSL, HTTP or HTTPS. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
     "checkIntervalSec": 42, # How often (in seconds) to send a health check. The default value is 5 seconds.
     "tcpHealthCheck": {
       "portName": "A String", # Port name as defined in InstanceGroup#NamedPort#name. If both port and port_name are defined, port takes precedence.
@@ -341,7 +341,7 @@
     },
     "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>
 
@@ -384,7 +384,7 @@
           },
           "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
           "timeoutSec": 42, # How long (in seconds) to wait before claiming failure. The default value is 5 seconds. It is invalid for timeoutSec to have greater value than checkIntervalSec.
-          "type": "A String", # Specifies the type of the healthCheck, either TCP, UDP, SSL, HTTP, HTTPS or HTTP2. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
+          "type": "A String", # Specifies the type of the healthCheck, either TCP, SSL, HTTP or HTTPS. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
           "checkIntervalSec": 42, # How often (in seconds) to send a health check. The default value is 5 seconds.
           "tcpHealthCheck": {
             "portName": "A String", # Port name as defined in InstanceGroup#NamedPort#name. If both port and port_name are defined, port takes precedence.
@@ -472,7 +472,7 @@
     },
     "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
     "timeoutSec": 42, # How long (in seconds) to wait before claiming failure. The default value is 5 seconds. It is invalid for timeoutSec to have greater value than checkIntervalSec.
-    "type": "A String", # Specifies the type of the healthCheck, either TCP, UDP, SSL, HTTP, HTTPS or HTTP2. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
+    "type": "A String", # Specifies the type of the healthCheck, either TCP, SSL, HTTP or HTTPS. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
     "checkIntervalSec": 42, # How often (in seconds) to send a health check. The default value is 5 seconds.
     "tcpHealthCheck": {
       "portName": "A String", # Port name as defined in InstanceGroup#NamedPort#name. If both port and port_name are defined, port takes precedence.
@@ -567,7 +567,7 @@
     },
     "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>
 
@@ -618,7 +618,7 @@
     },
     "description": "A String", # An optional description of this resource. Provide this property when you create the resource.
     "timeoutSec": 42, # How long (in seconds) to wait before claiming failure. The default value is 5 seconds. It is invalid for timeoutSec to have greater value than checkIntervalSec.
-    "type": "A String", # Specifies the type of the healthCheck, either TCP, UDP, SSL, HTTP, HTTPS or HTTP2. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
+    "type": "A String", # Specifies the type of the healthCheck, either TCP, SSL, HTTP or HTTPS. If not specified, the default is TCP. Exactly one of the protocol-specific health check field must be specified, which must match type field.
     "checkIntervalSec": 42, # How often (in seconds) to send a health check. The default value is 5 seconds.
     "tcpHealthCheck": {
       "portName": "A String", # Port name as defined in InstanceGroup#NamedPort#name. If both port and port_name are defined, port takes precedence.
@@ -713,7 +713,7 @@
     },
     "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>