current doc of dmctl is not updated

[Ehco1996]

Change Request

This repository is ONLY used to solve issues related to TiDB Data Migration (DM) documentation.
For other issues (related to TiDB, PD, etc), please move to other repositories.

Please answer the following questions before submitting your issue. Thanks!

1. Describe what you find is inappropriate or missing in the existing docs.

now: https://docs.pingcap.com/zh/tidb-data-migration/stable/dmctl-introduction

Welcome to dmctl
Release Version: v2.0.3
Git Commit Hash: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Git Branch: release-2.0
UTC Build Time: yyyy-mm-dd hh:mm:ss
Go Version: go version go1.13 linux/amd64

» help
DM control

Usage:
  dmctl [command]

Available Commands:
  check-task      Checks the configuration file of the task.
  config          Commands to import/export config.
  get-config      Gets the configuration.
  handle-error    `skip`/`replace`/`revert` the current error event or a specific binlog position (binlog-pos) event.
  help            Help about any command
  list-member     Lists member information.
  offline-member  Offlines member which has been closed.
  operate-leader  `evict`/`cancel-evict` the leader.
  operate-schema  `get`/`set`/`remove` the schema for an upstream table.
  operate-source  `create`/`update`/`stop`/`show` upstream MySQL/MariaDB source.
  pause-relay     Pauses DM-worker's relay unit.
  pause-task      Pauses a specified running task.
  purge-relay     Purges relay log files of the DM-worker according to the specified filename.
  query-status    Queries task status.
  resume-relay    Resumes DM-worker's relay unit.
  resume-task     Resumes a specified paused task.
  show-ddl-locks  Shows un-resolved DDL locks.
  start-task      Starts a task as defined in the configuration file.
  stop-task       Stops a specified task.
  unlock-ddl-lock Unlocks DDL lock forcefully.

Flags:
  -h, --help             help for dmctl
  -s, --source strings   MySQL Source ID.

Use "dmctl [command] --help" for more information about a command.

dmctl in v5.3.0

DM control

Usage:
  dmctl [flags]
  dmctl [command]

Available Commands:
  binlog          manage upstream binlog operations
  binlog-schema   manage or show source-table schema schemas
  check-task      Checks the configuration file of the task
  config          manage config operations
  decrypt         Decrypts cipher text to plain text
  encrypt         Encrypts plain text to cipher text
  help            Gets help about any command
  list-member     Lists member information
  offline-member  Offlines member which has been closed
  operate-leader  `evict`/`cancel-evict` the leader
  operate-source  `create`/`update`/`stop`/`show` upstream MySQL/MariaDB source
  pause-relay     Pauses DM-worker's relay unit
  pause-task      Pauses a specified running task or all (sub)tasks bound to a source
  purge-relay     Purges relay log files of the DM-worker according to the specified filename
  query-status    Queries task status
  resume-relay    Resumes DM-worker's relay unit
  resume-task     Resumes a specified paused task or all (sub)tasks bound to a source
  shard-ddl-lock  maintain or show shard-ddl locks information
  start-relay     Starts workers pulling relay log for a source
  start-task      Starts a task as defined in the configuration file
  stop-relay      Stops workers pulling relay log for a source
  stop-task       Stops a specified task or all (sub)tasks bound to a source
  transfer-source Transfers a upstream MySQL/MariaDB source to a free worker

Flags:
      --config string        Path to config file.
  -h, --help                 help for dmctl
      --master-addr string   Master API server address, this parameter is required when interacting with the dm-master
      --rpc-timeout string   RPC timeout, default is 10m. (default "10m")
  -s, --source strings       MySQL Source ID.
      --ssl-ca string        Path of file that contains list of trusted SSL CAs for connection.
      --ssl-cert string      Path of file that contains X509 certificate in PEM format for connection.
      --ssl-key string       Path of file that contains X509 key in PEM format for connection.
  -V, --version              Prints version and exit.

Use "dmctl [command] --help" for more information about a command.

2. Describe your suggestion or addition.

update to new version

3. Provide some reference materials (documents, websites, etc) if you could.

[shichun-0415]

@sunzhaoyang PTAL. thanks.

[shichun-0415]

Fixed in https://github.com/pingcap/docs-cn/pull/8683/files.