Update br-checkpoint-backup.md

Author: qiancai

br/br-checkpoint-backup.md

@@ -12,7 +12,7 @@ In TiDB v6.5.0, Backup & Restore (B) introduces the checkpoint backup feature to
 
 ## Application scenarios
 
-If your TiDB cluster is large and cannot affords to backup again after a failure, you can use the checkpoint backup feature. The br command-line tool (hereinafter referred to as `br`) periodically records the shards that have been backed up. In this way, the next backup retry can use the backup progress close to the abnormal exit.
+If your TiDB cluster is large and cannot affords to backup again after a failure, users can use the checkpoint backup feature. The br command-line tool (hereinafter referred to as `br`) periodically records the shards that have been backed up. In this way, the next backup retry can use the backup progress close to the abnormal exit.
 
 ## Implementation details
 
@@ -30,7 +30,7 @@ Checkpoint backup relies on the GC mechanism and cannot recover all data that ha
 
 During the backup, `br` periodically updates the `gc-safepoint` of the backup snapshot in PD to avoid data being garbage collected. When `br` exits, the `gc-safepoint` cannot be updated in time. As a result, before the next backup retry, the data might have been garbage collected.
 
-To avoid this situation, `br` keeps the `gc-safepoint` for about one hour by default when `gcttl` is not specified. You can set the `gcttl` parameter to extend the retention period if needed .
+To avoid this situation, `br` keeps the `gc-safepoint` for about one hour by default when `gcttl` is not specified. Users can set the `gcttl` parameter to extend the retention period if needed .
 
 The following example sets `gcttl` to 15 hours (54000 seconds) to extend the retention period of `gc-safepoint`:
 
@@ -42,7 +42,7 @@ tiup br backup full \
 
 > **Note:**
 >
-> The `gc-safepoint` created before backup is deleted after the snapshot backup is completed. You do not need to delete it manually.
+> The `gc-safepoint` created before backup is deleted after the snapshot backup is completed. Users do not need to delete it manually.
 
 ### Some data needs to be backed up again