Clarify task TTL definition

Author: LucaButBoring

docs/specification/draft/basic/utilities/tasks.mdx

@@ -123,7 +123,7 @@ Task-augmented requests follow a two-phase response pattern that differs from no
 - **Normal requests**: The server processes the request and returns the actual operation result directly.
 - **Task-augmented requests**: The server accepts the request and immediately returns a `CreateTaskResult` containing task metadata. The actual operation result becomes available later through `tasks/result` after the task completes.
 
-To create a task, requestors send a request with the `task` field included in the request params. Requestors **MAY** include a `ttl` value representing how long from task creation the requestor would like the task to be retained for.
+To create a task, requestors send a request with the `task` field included in the request params. Requestors **MAY** include a `ttl` value indicating the desired task lifetime duration (in milliseconds) since its creation.
 
 **Request:**