restore: add load stats description (#16846) (#16862)

br/br-snapshot-manual.md

@@ -112,7 +112,7 @@ br backup full \
 
 ## Back up statistics
 
-Starting from TiDB v7.5.0, the `br` command-line tool introduces the `--ignore-stats` parameter. When you set this parameter to `false`, the `br` command-line tool supports backing up and restoring statistics of columns, indexes, and tables. In this case, you do not need to manually run the statistics collection task for the TiDB database restored from the backup, or wait for the completion of the automatic collection task. This feature simplifies the database maintenance work and improves the query performance.
+Starting from TiDB v7.5.0, the `br` command-line tool introduces the `--ignore-stats` parameter. When you set this parameter to `false`, the `br` command-line tool supports backing up statistics of columns, indexes, and tables. In this case, you do not need to manually run the statistics collection task for the TiDB database restored from the backup, or wait for the completion of the automatic collection task. This feature simplifies the database maintenance work and improves the query performance.
 
 If you do not set this parameter to `false`, the `br` command-line tool uses the default setting `--ignore-stats=true`, which means statistics are not backed up during data backup.
 
@@ -124,7 +124,7 @@ br backup full \
 --ignore-stats=false
 ```
 
-After backing up data with the preceding configuration, when you restore data, the `br` command-line tool automatically restores table statistics if table statistics are included in the backup:
+After backing up data with the preceding configuration, when you restore data, the `br` command-line tool automatically restores table statistics if table statistics are included in the backup (Starting from v8.0.0, the `br` command-line tool introduces the `--load-stats` parameter, which controls whether to restore backup statistics. The default behavior is to restore backup statistics. There is no need to set it to `false` in most cases):
 
 ```shell
 br restore full \