Need to add the keep_oidc_scopes_in_consent_url configuration in the document for IS 6.1.0.

[Akila94]

Location : https://ob.docs.wso2.com/en/latest/install-and-setup/configuring-identity-server-for-ob/

We need to add the following configuration to the documentation for IS 6.1.0. This configuration should be enabled in the OB setups which uses Identity Server 6.1.0 as the base product.

[oauth]
keep_oidc_scopes_in_consent_url = true

The original PR with the fix is: https://github.com/wso2-support/identity-inbound-auth-oauth/pull/1609

[Akila94]

The original OB issue is: https://github.com/wso2-enterprise/ob-compliance-toolkit-cds/issues/249