[Docs-only] add version command to docs

[C0rby]

We could consider just pasting the usage printed by the commands to the docs since they are 'documentation' and are easier to update.

For example here the usage from the accounts service:

NAME:
   ocis accounts - Start accounts server

USAGE:
   ocis accounts command [command options] [arguments...]

COMMANDS:
   list, ls        List existing accounts
   add, create, a  Create a new account
   update          Make changes to an existing account
   remove, rm      Removes an existing account
   inspect         Show detailed data on an existing account
   version         Print the versions of the running instances
   help, h         Shows a list of commands or help for one command

OPTIONS:
   --http-namespace value             Set the base namespace for the http namespace (default: "com.owncloud.web") [$ACCOUNTS_HTTP_NAMESPACE]
   --http-addr value                  Address to bind http server (default: "0.0.0.0:9181") [$ACCOUNTS_HTTP_ADDR]
   --http-root value                  Root path of http server (default: "/") [$ACCOUNTS_HTTP_ROOT]
   --grpc-namespace value             Set the base namespace for the grpc namespace (default: "com.owncloud.api") [$ACCOUNTS_GRPC_NAMESPACE]
   --grpc-addr value                  Address to bind grpc server (default: "0.0.0.0:9180") [$ACCOUNTS_GRPC_ADDR]
   --name value                       service name (default: "accounts") [$ACCOUNTS_NAME]
   --accounts-data-path value         accounts folder (default: "/var/tmp/ocis-accounts") [$ACCOUNTS_DATA_PATH]
   --asset-path value                 Path to custom assets [$ACCOUNTS_ASSET_PATH]
   --jwt-secret value                 Used to create JWT to talk to reva, should equal reva's jwt-secret (default: "Pive-Fumkiu4") [$ACCOUNTS_JWT_SECRET]
   --storage-disk-path value          Path on the local disk, e.g. /var/tmp/ocis-accounts [$ACCOUNTS_STORAGE_DISK_PATH]
   --storage-cs3-provider-addr value  bind address for the metadata storage provider (default: "localhost:9215") [$ACCOUNTS_STORAGE_CS3_PROVIDER_ADDR]
   --storage-cs3-data-url value       http endpoint of the metadata storage (default: "http://localhost:9216") [$ACCOUNTS_STORAGE_CS3_DATA_URL]
   --storage-cs3-data-prefix value    path prefix for the http endpoint of the metadata storage, without leading slash (default: "data") [$ACCOUNTS_STORAGE_CS3_DATA_PREFIX]
   --storage-cs3-jwt-secret value     Used to create JWT to talk to reva, should equal reva's jwt-secret (default: "Pive-Fumkiu4") [$ACCOUNTS_STORAGE_CS3_JWT_SECRET]
   --service-user-uuid value          uuid of the internal service user (required on EOS) (default: "95cb8724-03b2-11eb-a0a6-c33ef8ef53ad") [$ACCOUNTS_SERVICE_USER_UUID]
   --service-user-username value      username of the internal service user (required on EOS) [$ACCOUNTS_SERVICE_USER_USERNAME]
   --service-user-uid value           uid of the internal service user (required on EOS) (default: 0) [$ACCOUNTS_SERVICE_USER_UID]
   --service-user-gid value           gid of the internal service user (required on EOS) (default: 0) [$ACCOUNTS_SERVICE_USER_GID]
   --uid-index-lower-bound value      define a starting point for the account UID (default: 0) [$ACCOUNTS_UID_INDEX_LOWER_BOUND]
   --gid-index-lower-bound value      define a starting point for the account GID (default: 1000) [$ACCOUNTS_GID_INDEX_LOWER_BOUND]
   --uid-index-upper-bound value      define an ending point for the account UID (default: 0) [$ACCOUNTS_UID_INDEX_UPPER_BOUND]
   --gid-index-upper-bound value      define an ending point for the account GID (default: 1000) [$ACCOUNTS_GID_INDEX_UPPER_BOUND]
   --help                             Show the help (default: false)
   --version                          Print the version (default: false)

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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