HDFS-14556: Spelling Mistake "gloablly" (#938)

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/hdfs.proto

@@ -38,7 +38,7 @@ import "acl.proto";
  * Extended block idenfies a block
  */
 message ExtendedBlockProto {
-  required string poolId = 1;   // Block pool id - gloablly unique across clusters
+  required string poolId = 1;   // Block pool id - globally unique across clusters
   required uint64 blockId = 2;  // the local id within a pool
   required uint64 generationStamp = 3;
   optional uint64 numBytes = 4 [default = 0];  // len does not belong in ebid