docs: update taosdemo/taosdump for cloud

docs/en/07-tools/03-taosbenchmark.md

@@ -94,6 +94,7 @@ taosBenchmark -f <json file>
 - **-f/--file <json file\>** :
   specify the configuration file to use. This file includes All parameters. Users should not use this parameter with other parameters on the command-line. There is no default value.
 
+- **-W/--cloud_dsn=<DSN\>** : The dsn to connect TDengine cloud service.
 - **-c/--config-dir <dir\>** :
   specify the directory of the TDengine cluster configuration file. the default path is `/etc/taos`.
 

docs/en/07-tools/04-taosdump.md

@@ -102,6 +102,8 @@ Usage: taosdump [OPTION...] dbname [tbname ...]
   -n, --no-escape            No escape char '`'. Default is using it.
   -T, --thread-num=THREAD_NUM   Number of thread for dump in file. Default is
                              5.
+  -C, --cloud=CLOUD_DSN      specify a DSN to access TDengine cloud service
+  -R, --restful              Use RESTful interface to connect TDengine
   -g, --debug                Print debug info.
   -?, --help                 Give this help list
       --usage                Give a short usage message