Update docs/modules/hdfs/pages/usage-guide/upgrading.adoc

Co-authored-by: Nick <10092581+NickLarsenNZ@users.noreply.github.com>

Author: nightkr

docs/modules/hdfs/pages/usage-guide/upgrading.adoc

@@ -44,7 +44,7 @@ Proceed with rolling upgrade:
 
 == Starting the upgrade
 
-Once ready, the HdfsCluster can be updated with the new product version:
+Once HDFS is ready to upgrade, the HdfsCluster can be updated with the new product version:
 
 [source,shell]
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