docs: fix for role sync issues in case of custom OAuth2 configuration

[ved-kashyap-samsung]

SUMMARY

Fixes #13243

Unable to list users on Superset main page settings despite having Admin role in case of custom OAuth2 configuration.

EXPECTED RESULT

If user has registered with Admin role then he should be able to list users for settings of Superset.

ACTUAL RESULT

User with Admin role is getting permission denied error when trying to list users from settings of Superset.

TESTING INSTRUCTIONS

please re-run superset init to sync the required permissions. Below is the command to re-run superset init using docker compose.

docker-compose exec superset superset init

ADDITIONAL INFORMATION

• Has associated issue: Fixes Can't open Settings -> List Users when using OAuth with Google for an Admin user #13243
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[ved-kashyap-samsung]

@rusackas Can you please review this PR. Thanks!