fix: Add explicit refresh_request_body and fix migration guide header

Co-Authored-By: suisui.xia@airbyte.io <suisui.xia@airbyte.io>

airbyte-integrations/connectors/source-zendesk-support/manifest.yaml

@@ -24,6 +24,11 @@ definitions:
     token_refresh_endpoint: "https://{{ config['subdomain'] }}.zendesk.com/oauth/tokens"
     refresh_request_headers:
       Content-Type: "application/json"
+    refresh_request_body:
+      grant_type: "refresh_token"
+      refresh_token: "{{ config['credentials']['refresh_token'] }}"
+      client_id: "{{ config['credentials']['client_id'] }}"
+      client_secret: "{{ config['credentials']['client_secret'] }}"
     refresh_token_updater:
       refresh_token_name: refresh_token
       access_token_config_path:

docs/integrations/sources/zendesk-support-migrations.md

@@ -1,7 +1,7 @@
-import MigrationGuide from '@site/static/_migration_guides_upgrade_guide.md';
-
 # Zendesk Support Migration Guide
 
+import MigrationGuide from '@site/static/_migration_guides_upgrade_guide.md';
+
 ## Upgrading to 4.0.0
 
 The pagination strategy has been changed from `Offset` to `Cursor-Based`. It is necessary to reset the stream.