build: run docs regen in synth.py (#1059)

diff --git a/docs/dyn/container_v1beta1.projects.zones.html b/docs/dyn/container_v1beta1.projects.zones.html
index 7b183a4..1473ef5 100644
--- a/docs/dyn/container_v1beta1.projects.zones.html
+++ b/docs/dyn/container_v1beta1.projects.zones.html
@@ -116,6 +116,12 @@
     "validMasterVersions": [ # List of valid master versions, in descending order.
       "A String",
     ],
+    "validImageTypes": [ # List of valid image types.
+      "A String",
+    ],
+    "validNodeVersions": [ # List of valid node upgrade target versions, in descending order.
+      "A String",
+    ],
     "channels": [ # List of release channel configurations.
       { # ReleaseChannelConfig exposes configuration for a release channel.
         "validVersions": [ # List of valid versions for the channel.
@@ -131,14 +137,8 @@
         "channel": "A String", # The release channel this configuration applies to.
       },
     ],
-    "defaultImageType": "A String", # Default image type.
     "defaultClusterVersion": "A String", # Version of Kubernetes the service deploys by default.
-    "validNodeVersions": [ # List of valid node upgrade target versions, in descending order.
-      "A String",
-    ],
-    "validImageTypes": [ # List of valid image types.
-      "A String",
-    ],
+    "defaultImageType": "A String", # Default image type.
   }</pre>
 </div>