SamlProviders AzureSaml need more information

[rmartins-nos]

in https://reportportal.io/docs/plugins/authorization/SamlProviders/AzureSaml/

need add this information:
Ensure that your SAML claims required Unique User Identifier is user.mail

[Pink-Bumblebee]

Hello @rmartins-nos , thank you for highlight. I think that we will add it into documentation.