update MD by dispatch event pingcap/docs-cn release-7.5

markdown-pages/zh/tidb/release-7.5/br/br-pitr-manual.md

@@ -289,7 +289,7 @@ Global Flags:
 
 ```shell
 ./br log truncate --until='2022-07-26 21:20:00+0800' \
-–-storage='s3://backup-101/logbackup?access-key=${access-key}&secret-access-key=${secret-access-key}"'
+--storage='s3://backup-101/logbackup?access-key=${access-key}&secret-access-key=${secret-access-key}'
 ```
 
 该子命令运行后输出以下信息：
@@ -329,7 +329,7 @@ Global Flags:
 使用示例：
 
 ```shell
-./br log metadata –-storage='s3://backup-101/logbackup?access-key=${access-key}&secret-access-key=${secret-access-key}"'
+./br log metadata --storage='s3://backup-101/logbackup?access-key=${access-key}&secret-access-key=${secret-access-key}'
 ```
 
 该子命令运行后输出以下信息：
@@ -380,7 +380,7 @@ Global Flags:
 ```shell
 ./br restore point --pd="${PD_IP}:2379"
 --storage='s3://backup-101/logbackup?access-key=${access-key}&secret-access-key=${secret-access-key}"'
---full-backup-storage='s3://backup-101/snapshot-202205120000?access-key=${access-key}&secret-access-key=${secret-access-key}"'
+--full-backup-storage='s3://backup-101/snapshot-202205120000?access-key=${access-key}&secret-access-key=${secret-access-key}'
 
 Full Restore <--------------------------------------------------------------------------------------------------------------------------------------------------------> 100.00%
 *** ***["Full Restore success summary"] ****** [total-take=3.112928252s] [restore-data-size(after-compressed)=5.056kB] [Size=5056] [BackupTS=434693927394607136] [total-kv=4] [total-kv-size=290B] [average-speed=93.16B/s]