br: make version compatible table more clear (#21154)

Author: RidRisR

br/backup-and-restore-overview.md

@@ -150,20 +150,23 @@ This section introduces the BR compatibility information for all [Long-Term Supp
 The following table lists the compatibility matrix for full backups. Note that all information in the table applies to newly created clusters. For clusters upgraded from a version earlier than v7.2.0 to v7.2.0 or later, their behavior is consistent with that of backups from v7.1.0.
 
 | Backup version | Compatible restore versions | Incompatible restore versions |
-|:--|:--|:--|
-| v6.5.0 | 7.1.0 | v7.5.0 and later |
-| v7.1.0 | - | v7.5.0 and later |
-| v7.5.0 | v7.5.0 and later | - |
-| v8.1.0 | v8.1.0 and later | - |
+|:---------|:----------------|:------------------|
+| v6.5.0    | v7.1.0           | v7.5.0 and later  |
+| v7.1.0    | -                | v7.5.0 and later  |
+| v7.5.0    | v7.5.0 and later | -                 |
+| v8.1.0    | v8.1.0 and later | -                 |
+| v8.5.0    | v8.5.0 and later | -                 |
 
 The following table lists the compatibility matrix for log backups. Note that all information in the table applies to newly created clusters. For clusters upgraded from a version earlier than v7.2.0 to v7.2.0 or later, their behavior is consistent with that of backups from v7.1.0.
 
 | Backup version | Compatible restore versions | Incompatible restore versions |
-|:--|:--|:--|
-| v6.5.0 | 7.1.0 | v7.5.0 and later |
-| v7.1.0 | - | v7.5.0 and later |
-| v7.5.0 | v7.5.0 and later | - |
-| v8.1.0 | v8.1.0 and later | - |
+|:---------|:----------------|:------------------|
+| v6.5.0    | v7.1.0           | v7.5.0 and later  |
+| v7.1.0    | -                | v7.5.0 and later  |
+| v7.5.0    | v7.5.0 and later | -                 |
+| v8.1.0    | v8.1.0 and later | -                 |
+| v8.5.0    | v8.5.0 and later | -                 |
+
 > **Note:**
 >
 > - When only data of non-system tables is backed up (full backup or log backup), all versions are compatible with each other.