Add information about m_useBatchWebhook on Extra tables

[ejfasting]

New checkbox/field on extratables: https://docs.superoffice.com/en/custom-objects/admin/create-extra-table.html

This property indicates whether batch updates should trigger webhooks or not.
Text: Enable batch webhook for this table
This is default set to false.

[digitaldiina]

@ejfasting We've received feedback requesting this info (ticket 3596873). Super if you could prioritize this task.