Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
diff --git a/docs/dyn/books_v1.notification.html b/docs/dyn/books_v1.notification.html
index 31252a0..c717df2 100644
--- a/docs/dyn/books_v1.notification.html
+++ b/docs/dyn/books_v1.notification.html
@@ -94,9 +94,11 @@
     "body": "A String",
     "doc_type": "A String",
     "kind": "books#notification", # Resource type.
+    "timeToExpireMs": "A String",
     "iconUrl": "A String",
     "dont_show_notification": True or False,
     "title": "A String",
+    "is_document_mature": True or False,
     "show_notification_settings_action": True or False,
     "crmExperimentIds": [ # The list of crm experiment ids.
       "A String",