product_url_format placeholder not resolved in the implement-login-with-par doc

[darshanasbg]

Is your suggestion related to a missing or misleading document? Please describe.
Refer the doc page: https://is.docs.wso2.com/en/latest/guides/authentication/oidc/implement-login-with-par/

product_url_format is not resolved correctly, leading to show content like this.

Describe the improvement
Should resolve product_url_format correctly and should have the content showed similar to following

https://localhost:9443/oauth2/authorize?client_id={CLIENT_ID}&request_uri={request_uri}