Automated Spec Update (#284)

ed6e389b2d16d19b21e68413ae8f4743dd9b9223

 Change Notes:

File Namespace:
- Add UploadSessionStartError union
- Add UploadSessionType union
- Update UploadSessionFinishError union to include concurrent_sessions_data_not_allowed, concurrent_session_not_closed, concurrent_session_missing_data
- Update UploadSessionType struct to include session_type
- Update upload_session/start to include UploadSessionStartError
- Update Comments

Team Log Namespace:
- Add AdminAlertingAlertConfiguration, AdminAlertingChangedAlertConfigDetails, MemberChangeResellerRoleDetails, TeamProfileAddBackgroundDetails, TeamProfileChangeBackgroundDetails, TeamProfileRemoveBackgroundDetails, AdminAlertingChangedAlertConfigType, MemberChangeResellerRoleType, TeamProfileAddBackgroundType, TeamProfileChangeBackgroundType, TeamProfileRemoveBackgroundType structs
- Add AdminAlertingAlertStatePolicy, ResellerRole unions
- Update EventCategory union to include admin_alerting
- Update GovernancePolicyRemoveFoldersDetails struct to include reason
- Update EventDetails union to include admin_alerting_changed_alert_config_details, member_change_reseller_role_details, team_profile_add_background_details, team_profile_change_background_details, team_profile_remove_background_details
- Update EventType union to include admin_alerting_changed_alert_config, member_change_reseller_role, team_profile_add_background, team_profile_change_background, team_profile_remove_background
- Update EventTypeArg to include admin_alerting_changed_alert_config, member_change_reseller_role, team_profile_add_background, team_profile_change_background, team_profile_remove_background
- Update Examples

Co-authored-by: Brent Bumann <bbumann@dropbox.com>

 de3a7718946ee79f1a0d5ca499b9d22b41cc7c84

Co-authored-by: DropboxBot <DropboxBot@users.noreply.github.com>

Author: DropboxBot

dropbox/base.py

@@ -2936,7 +2936,8 @@ def files_upload_session_finish_batch_check(self,
 
     def files_upload_session_start(self,
                                    f,
-                                   close=False):
+                                   close=False,
+                                   session_type=None):
         """
         Upload sessions allow you to upload a single file in one or more
         requests, for example where the size of the file is greater than 150 MB.
@@ -2955,15 +2956,40 @@ def files_upload_session_start(self,
         allowed per month. For more information, see the `Data transport limit
         page
         <https://www.dropbox.com/developers/reference/data-transport-limit>`_.
+        By default, upload sessions require you to send content of the file in
+        sequential order via consecutive :meth:`files_upload_session_start`,
+        :meth:`files_upload_session_append_v2`,
+        :meth:`files_upload_session_finish` calls. For better performance, you
+        can instead optionally use a ``UploadSessionType.concurrent`` upload
+        session. To start a new concurrent session, set
+        ``UploadSessionStartArg.session_type`` to
+        ``UploadSessionType.concurrent``. After that, you can send file data in
+        concurrent :meth:`files_upload_session_append_v2` requests. Finally
+        finish the session with :meth:`files_upload_session_finish`. There are
+        couple of constraints with concurrent sessions to make them work. You
+        can not send data with :meth:`files_upload_session_start` or
+        :meth:`files_upload_session_finish` call, only with
+        :meth:`files_upload_session_append_v2` call. Also data uploaded in
+        :meth:`files_upload_session_append_v2` call must be multiple of 4194304
+        bytes (except for last :meth:`files_upload_session_append_v2` with
+        ``UploadSessionStartArg.close`` to ``True``, that may contain any
+        remaining data).
 
         :param bytes f: Contents to upload.
         :param bool close: If true, the current session will be closed, at which
             point you won't be able to call
             :meth:`files_upload_session_append_v2` anymore with the current
             session.
+        :param Nullable session_type: Type of upload session you want to start.
+            If not specified, default is ``UploadSessionType.sequential``.
         :rtype: :class:`dropbox.files.UploadSessionStartResult`
+        :raises: :class:`.exceptions.ApiError`
+
+        If this raises, ApiError will contain:
+            :class:`dropbox.files.UploadSessionStartError`
         """
-        arg = files.UploadSessionStartArg(close)
+        arg = files.UploadSessionStartArg(close,
+                                          session_type)
         r = self.request(
             files.upload_session_start,
             'files',