docs: 'uc docs' command to generate CLI reference docs

website/docs/9-cli-reference/uc_machine_token.md

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+# uc machine token
+
+Print the local machine's token for adding it to a cluster.
+
+```
+uc machine token [flags]
+```
+
+## Options
+
+```
+  -d, --data-dir string   Directory for storing persistent machine state. (default "/var/lib/uncloud")
+  -h, --help              help for token
+```
+
+## Options inherited from parent commands
+
+```
+      --connect string          Connect to a remote cluster machine without using the Uncloud configuration file.
+                                Format: [ssh://]user@host[:port] or tcp://host:port
+      --uncloud-config string   Path to the Uncloud configuration file. (default "~/.config/uncloud/config.yaml")
+```
+
+## See also
+
+* [uc machine](uc_machine.md)	 - Manage machines in an Uncloud cluster.
+