Add cases for full compaction config for non-utc time zone (#17704)

tikv-configuration-file.md

@@ -1039,7 +1039,8 @@ Configuration items related to Raftstore.
 
 + Set the specific times that TiKV initiates periodic full compaction. You can specify multiple time schedules in an array. For example:
     + `periodic-full-compact-start-times = ["03:00", "23:00"]` indicates that TiKV performs full compaction daily at 03:00 AM and 11:00 PM, based on the local time zone of the TiKV node.
-    + `periodic-full-compact-start-times = ["03:00 +0000", "23:00 +0000"]` indicates that TiKV performs full compaction daily at 03:00 AM and 11:00 PM in UTC time.
+    + `periodic-full-compact-start-times = ["03:00 +0000", "23:00 +0000"]` indicates that TiKV performs full compaction daily at 03:00 AM and 11:00 PM in UTC timezone.
+    + `periodic-full-compact-start-times = ["03:00 +0800", "23:00 +0800"]` indicates that TiKV performs full compaction daily at 03:00 AM and 11:00 PM in UTC+08:00 timezone.
 + Default value: `[]`, which means periodic full compaction is disabled by default.
 
 ### `periodic-full-compact-start-max-cpu` <span class="version-mark">New in v7.6.0</span>