Fix typo in comment in scheduler engine

This commit fixes a minor typo in a big block comment in
SchedulerEngine.java.

Author: jasontedor

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/scheduler/SchedulerEngine.java

@@ -194,7 +194,7 @@ public void run() {
                 /*
                  * Allowing the throwable to escape here will lead to be it being caught in FutureTask#run and set as the outcome of this
                  * task; however, we never inspect the the outcomes of these scheduled tasks and so allowing the throwable to escape
-                 * unhandled here could lead to use losing fatal errors. Instead, we rely on ExceptionsHelper#dieOnError to appropriately
+                 * unhandled here could lead to us losing fatal errors. Instead, we rely on ExceptionsHelper#dieOnError to appropriately
                  * dispatch any error to the uncaught exception handler. We should never see an exception here as these do not escape from
                  * SchedulerEngine#notifyListeners.
                  */