address review comments

Author: kiszk

sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/HDFSBackedStateStoreProvider.scala

@@ -364,9 +364,9 @@ private[state] class HDFSBackedStateStoreProvider extends StateStoreProvider wit
             ByteStreams.readFully(input, valueRowBuffer, 0, valueSize)
             val valueRow = new UnsafeRow(valueSchema.fields.length)
             // If valueSize in existing file is not multiple of 8, floor it to multiple of 8.
-            // This is work around for the following.
-            // Pre-Spark 2.3 mistakenly append 4 bytes to the value row in
-            // `FixedLengthRowBasedKeyValueBatch`, which gets persisted into the checkpoint data
+            // This is a workaround for the following:
+            // Prior to Spark 2.3 mistakenly append 4 bytes to the value row in
+            // `RowBasedKeyValueBatch`, which gets persisted into the checkpoint data
             valueRow.pointTo(valueRowBuffer, (valueSize / 8) * 8)
             map.put(keyRow, valueRow)
           }
@@ -432,9 +432,9 @@ private[state] class HDFSBackedStateStoreProvider extends StateStoreProvider wit
             ByteStreams.readFully(input, valueRowBuffer, 0, valueSize)
             val valueRow = new UnsafeRow(valueSchema.fields.length)
             // If valueSize in existing file is not multiple of 8, floor it to multiple of 8.
-            // This is work around for the following.
-            // Pre-Spark 2.3 mistakenly append 4 bytes to the value row in
-            // `FixedLengthRowBasedKeyValueBatch`, which gets persisted into the checkpoint data
+            // This is a workaround for the following:
+            // Prior to Spark 2.3 mistakenly append 4 bytes to the value row in
+            // `RowBasedKeyValueBatch`, which gets persisted into the checkpoint data
             valueRow.pointTo(valueRowBuffer, (valueSize / 8) * 8)
             map.put(keyRow, valueRow)
           }