[DOC] Documentation on how to `Trying out saml app with WSO2 Identity Server in a tenant`

[UdeshAthukorala]

Is your suggestion related to a missing or misleading document? Please describe. Currently we don't have the information about how to trying out a saml app with a tenant in IS official documentations.[1]

Describe the improvement There are some additional configurations we need to follow when trying out saml app with a tenant. We can found out the steps from this blog. [2] Need to document these steps in IS official documentations.

Ref: [1] https://is.docs.wso2.com/en/latest/learn/deploying-the-sample-app/#deploying-the-saml2-web-app-pickup-dispatch-webapp [2] https://piraveenaparalogarajah.medium.com/trying-out-saml2-pick-up-dispatch-app-with-wso2-identity-server-in-a-tenant-20626ac4865a