Update JWT docs (#96623)

docs/sources/setup-grafana/configure-security/configure-authentication/jwt/index.md

@@ -23,6 +23,10 @@ This method of authentication is useful for integrating with other systems that
 use JWKS but can't directly integrate with Grafana or if you want to use pass-through
 authentication in an app embedding Grafana.
 
+{{% admonition type="note" %}}
+Grafana does not currently support refresh tokens.
+{{% /admonition %}}
+
 ## Enable JWT
 
 To use JWT authentication:
@@ -183,7 +187,8 @@ key_id = my-key-id
 
 By default, only `"exp"`, `"nbf"` and `"iat"` claims are validated.
 
-You might also want to validate that other claims are really what you expect them to be.
+Consider validating that other claims match your expectations by using the `expect_claims` configuration option.
+Token claims must match exactly the values set here.
 
 ```ini
 # This can be seen as a required "subset" of a JWT Claims Set.