YARN-4404. Corrected typo in javadoc.

            Contributed by Yesha Vora

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/RMServerUtils.java

@@ -240,7 +240,7 @@ public class RMServerUtils {
   }
 
   /**
-   * Utility method to validate a list resource requests, by insuring that the
+   * Utility method to validate a list resource requests, by ensuring that the
    * requested memory/vcore is non-negative and not greater than max
    */
   public static void normalizeAndValidateRequests(List<ResourceRequest> ask,

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/SchedulerUtils.java

@@ -195,7 +195,7 @@ public class SchedulerUtils {
   }
 
   /**
-   * Utility method to normalize a resource request, by insuring that the
+   * Utility method to normalize a resource request, by ensuring that the
    * requested memory is a multiple of minMemory and is not zero.
    */
   @VisibleForTesting
@@ -210,7 +210,7 @@ public class SchedulerUtils {
   }
 
   /**
-   * Utility method to normalize a resource request, by insuring that the
+   * Utility method to normalize a resource request, by ensuring that the
    * requested memory is a multiple of increment resource and is not zero.
    *
    * @return normalized resource
@@ -304,7 +304,7 @@ public class SchedulerUtils {
   }
 
   /**
-   * Utility method to validate a resource request, by insuring that the
+   * Utility method to validate a resource request, by ensuring that the
    * requested memory/vcore is non-negative and not greater than max
    *
    * @throws InvalidResourceRequestException when there is invalid request