2.0 upgrade guide

Author: maastha

docs/guides/2.0.0-upgrade-guide.md

@@ -57,7 +57,7 @@ Resource:
   - `export` and `auto_export_enabled` are now optional only arguments. This facilitates tracking changes in their configurations. 
   - `copy_settings.#.replication_spec_id` attribute has been removed. Use `copy_settings.#.zone_id` instead. To learn more, see the [1.18.0 upgrade guide](../guides/1.18.0-upgrade-guide.md#transition-cloud-backup-schedules-for-clusters-to-use-zones).
 
-Data sources:
+Data source:
   - `copy_settings.#.replication_spec_id` and `use_zone_id_for_copy_settings` attributes have been removed. Remove any usage of `use_zone_id_for_copy_settings` & replace any references to `copy_settings.#.replication_spec_id` in your configurations with `copy_settings.#.zone_id`. To learn more, see the [1.18.0 upgrade guide](../guides/1.18.0-upgrade-guide.md#transition-cloud-backup-schedules-for-clusters-to-use-zones).