Update docs/reference/migration/apis/data-stream-reindex.asciidoc

Co-authored-by: Keith Massey <[email protected]>

Author: lukewhiting

docs/reference/migration/apis/data-stream-reindex.asciidoc

@@ -22,7 +22,7 @@ This api runs in the background because reindexing all indices in a large data s
 is expected to take a large amount of time and resources. The endpoint will return immediately and a persistent
 task will be created to run in the background. The current status of the task can be checked with
 the <<data-stream-reindex-status-api,reindex status API>>. This status will be available for 24 hours after the task
-completes, whether it finished successfully or failed however only the last status is retained so re-running a reindex
+completes, whether it finished successfully or failed. However, only the last status is retained so re-running a reindex
 will overwrite the previous status for that data stream. A running or recently completed data stream reindex task can be
 cancelled using the <<data-stream-reindex-cancel-api,reindex cancel API>>.