Document trial demo identity service for tinymceai_token_provider

Author: kemister85

modules/ROOT/pages/tinymceai.adoc

@@ -24,7 +24,7 @@ liveDemo::{plugincode}[]
 To set up the {pluginname} plugin in {productname}:
 
 * add `{plugincode}` to the `plugins` option in the editor configuration;
-* configure the `tinymceai_token_provider` option to provide authentication tokens (must return `+{ token: string }+`). During a {cloudname} trial, the xref:tinymceai-jwt-authentication-intro.adoc#trial-demo-identity-service[demo identity service] can issue JWTs without a dedicated token endpoint;
+* configure the `tinymceai_token_provider` option to provide authentication tokens (must return `+{ token: string }+`). During a {cloudname} trial, the xref:tinymceai-jwt-authentication-intro.adoc#trial-demo-identity-service[demo identity service] can supply JWTs so a custom token endpoint is not required;
 * when the `toolbar` option is omitted or left at the default, the Silver theme toolbar already includes the AI toolbar buttons once the plugin is enabled: `+tinymceai-chat+` image:icons-premium/ai-assistant.svg[Chat icon,24px], `+tinymceai-quickactions+` image:icons/ai-prompt.svg[Quick Actions icon,24px], and `+tinymceai-review+` image:icons-premium/ai-review.svg[Review icon,24px]. When a custom `toolbar` string is set, add those button ids to the string explicitly.
 
 [[minimal-setup]]

modules/ROOT/partials/configuration/tinymceai_options.adoc

@@ -53,6 +53,11 @@ The JWT payload must include these required claims:
 
 For more information about JWT setup, required claims, and the authentication object, see xref:tinymceai-jwt-authentication-intro.adoc[JWT Authentication].
 
+[NOTE]
+====
+During a {cloudname} trial, a xref:tinymceai-jwt-authentication-intro.adoc#trial-demo-identity-service[demo identity service] is available so `tinymceai_token_provider` can obtain JWTs without implementing a custom token endpoint. See xref:tinymceai-jwt-authentication-intro.adoc[JWT Authentication] for setup and examples.
+====
+
 The function must return the token value within an object with a `+token+` property. Ensure the response from the token endpoint is handled correctly, based on the response format:
 
 * **JSON response**: Endpoint returns `+{ "token": "eyJ..." }+`. Use `+fetch(url).then(r => r.json())+`.