Update JavaDoc

Author: jan-elastic

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/inference/assignment/TrainedModelAssignment.java

@@ -144,7 +144,7 @@ private TrainedModelAssignment(
      * @param assignmentState used to track the state of the assignment for rebalancing, autoscaling, and more
      * @param reason may contain a human-readable explanation for the current state
      * @param startTime the time when the assignment was created
-     * @param maxAssignedAllocations used for adaptive allocations
+     * @param maxAssignedAllocations keeps track of the maximum number of allocations used for this assignment
      * @param adaptiveAllocationsSettings how the assignment should scale based on usage
      */
     TrainedModelAssignment(