[ML] Update error message for process update (#37363)

When this message was first added the model debug config was
the only thing that could be updated, but now more aspects of
the config can be updated so the message needs to be more
general.

x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/process/autodetect/AutodetectProcessManager.java

@@ -337,7 +337,7 @@ public class AutodetectProcessManager {
     public void writeUpdateProcessMessage(JobTask jobTask, UpdateParams updateParams, Consumer<Exception> handler) {
         AutodetectCommunicator communicator = getOpenAutodetectCommunicator(jobTask);
         if (communicator == null) {
-            String message = "Cannot process update model debug config because job [" + jobTask.getJobId() +
+            String message = "Cannot update the job config because job [" + jobTask.getJobId() +
                 "] does not have a corresponding autodetect process";
             logger.debug(message);
             handler.accept(ExceptionsHelper.conflictStatusException(message));