Update "Ratify and Azure Policy" guide in the "Ratify on Azure" doc

[yizha1]

There are sevearl scenarios described in the doc of "Ratify on Azure". For validating Notary Project signatures with Ratify and Azure Policy, it is recommended to replace relevent content with a reference to the https://learn.microsoft.com/en-us/azure/security/container-secure-supply-chain/articles/validating-image-signatures-using-ratify-aks.