Provide examples for B2C and CIAM

Author: rayluo

msal/authority.py

@@ -120,6 +120,8 @@ def __init__(
                 "Unable to get authority configuration for {}. "
                 "Authority would typically be in a format of "
                 "https://login.microsoftonline.com/your_tenant "
+                "or https://tenant_name.ciamlogin.com "
+                "or https://tenant_name.b2clogin.com/tenant.onmicrosoft.com/policy. "
                 "Also please double check your tenant name or GUID is correct.".format(
                 authority_url))
         logger.debug("openid_config = %s", openid_config)