Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
diff --git a/docs/dyn/gmail_v1.users.messages.html b/docs/dyn/gmail_v1.users.messages.html
index bcdab0e..7e8e136 100644
--- a/docs/dyn/gmail_v1.users.messages.html
+++ b/docs/dyn/gmail_v1.users.messages.html
@@ -424,7 +424,7 @@
     {
     "nextPageToken": "A String", # Token to retrieve the next page of results in the list.
     "resultSizeEstimate": 42, # Estimated total number of results.
-    "messages": [ # List of messages.
+    "messages": [ # List of messages. Note that each message resource contains only an id and a threadId. Additional message details can be fetched using the messages.get method.
       { # An email message.
         "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
         "historyId": "A String", # The ID of the last history record that modified this message.