HDFS-13447. Fix Typos - Node Not Chosen. Contributed by Beluga Behr.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java

@@ -72,11 +72,11 @@ public class BlockPlacementPolicyDefault extends BlockPlacementPolicy {
       .withInitial(() -> new HashMap<NodeNotChosenReason, Integer>());
 
   private enum NodeNotChosenReason {
-    NOT_IN_SERVICE("the node isn't in service"),
+    NOT_IN_SERVICE("the node is not in service"),
     NODE_STALE("the node is stale"),
     NODE_TOO_BUSY("the node is too busy"),
     TOO_MANY_NODES_ON_RACK("the rack has too many chosen nodes"),
-    NOT_ENOUGH_STORAGE_SPACE("no enough storage space to place the block");
+    NOT_ENOUGH_STORAGE_SPACE("not enough storage space to place the block");
 
     private final String text;