Update docs for 1.4.0 release
diff --git a/docs/dyn/dns_v1beta1.managedZones.html b/docs/dyn/dns_v1beta1.managedZones.html
index 33d6b28..e82fec8 100644
--- a/docs/dyn/dns_v1beta1.managedZones.html
+++ b/docs/dyn/dns_v1beta1.managedZones.html
@@ -101,7 +101,7 @@
 
 { # A zone is a subtree of the DNS namespace under one administrative responsibility. A ManagedZone is a resource that represents a DNS zone hosted by the Cloud DNS service.
     "kind": "dns#managedZone", # Identifies what kind of resource this is. Value: the fixed string "dns#managedZone".
-    "description": "A String", # A string to associate with this resource for the user's convenience. Has no effect on the managed zone's function.
+    "description": "A String", # A mutable string of at most 1024 characters associated with this resource for the user's convenience. Has no effect on the managed zone's function.
     "nameServers": [ # Delegate your managed_zone to these virtual name servers; defined by the server (output only)
       "A String",
     ],
@@ -118,7 +118,7 @@
 
     { # A zone is a subtree of the DNS namespace under one administrative responsibility. A ManagedZone is a resource that represents a DNS zone hosted by the Cloud DNS service.
       "kind": "dns#managedZone", # Identifies what kind of resource this is. Value: the fixed string "dns#managedZone".
-      "description": "A String", # A string to associate with this resource for the user's convenience. Has no effect on the managed zone's function.
+      "description": "A String", # A mutable string of at most 1024 characters associated with this resource for the user's convenience. Has no effect on the managed zone's function.
       "nameServers": [ # Delegate your managed_zone to these virtual name servers; defined by the server (output only)
         "A String",
       ],
@@ -153,7 +153,7 @@
 
     { # A zone is a subtree of the DNS namespace under one administrative responsibility. A ManagedZone is a resource that represents a DNS zone hosted by the Cloud DNS service.
       "kind": "dns#managedZone", # Identifies what kind of resource this is. Value: the fixed string "dns#managedZone".
-      "description": "A String", # A string to associate with this resource for the user's convenience. Has no effect on the managed zone's function.
+      "description": "A String", # A mutable string of at most 1024 characters associated with this resource for the user's convenience. Has no effect on the managed zone's function.
       "nameServers": [ # Delegate your managed_zone to these virtual name servers; defined by the server (output only)
         "A String",
       ],
@@ -185,7 +185,7 @@
     "managedZones": [ # The managed zone resources.
       { # A zone is a subtree of the DNS namespace under one administrative responsibility. A ManagedZone is a resource that represents a DNS zone hosted by the Cloud DNS service.
           "kind": "dns#managedZone", # Identifies what kind of resource this is. Value: the fixed string "dns#managedZone".
-          "description": "A String", # A string to associate with this resource for the user's convenience. Has no effect on the managed zone's function.
+          "description": "A String", # A mutable string of at most 1024 characters associated with this resource for the user's convenience. Has no effect on the managed zone's function.
           "nameServers": [ # Delegate your managed_zone to these virtual name servers; defined by the server (output only)
             "A String",
           ],