Update spec/src/main/java/io/a2a/spec/TaskStatusUpdateEvent.java

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: kabir

spec/src/main/java/io/a2a/spec/TaskStatusUpdateEvent.java

@@ -30,12 +30,12 @@ public record TaskStatusUpdateEvent(
 
     /**
      * Compact constructor with validation.
-     *
      * @param taskId the task identifier (required)
      * @param status the task status (required)
      * @param contextId the context identifier (required)
      * @param isFinal whether this is a final status
      * @param metadata additional metadata (optional)
+     * @throws IllegalArgumentException if taskId, status, or contextId is null
      */
     public TaskStatusUpdateEvent {
         Assert.checkNotNullParam("taskId", taskId);