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

diff --git a/docs/dyn/pubsub_v1beta2.projects.topics.subscriptions.html b/docs/dyn/pubsub_v1beta2.projects.topics.subscriptions.html
index 29d482a..b41135e 100644
--- a/docs/dyn/pubsub_v1beta2.projects.topics.subscriptions.html
+++ b/docs/dyn/pubsub_v1beta2.projects.topics.subscriptions.html
@@ -106,10 +106,10 @@
   An object of the form:
 
     { # Response for the `ListTopicSubscriptions` method.
-    "nextPageToken": "A String", # If not empty, indicates that there may be more subscriptions that match the request; this value should be passed in a new `ListTopicSubscriptionsRequest` to get more subscriptions.
     "subscriptions": [ # The names of the subscriptions that match the request.
       "A String",
     ],
+    "nextPageToken": "A String", # If not empty, indicates that there may be more subscriptions that match the request; this value should be passed in a new `ListTopicSubscriptionsRequest` to get more subscriptions.
   }</pre>
 </div>