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

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

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+# uc volume ls
+
+List volumes across all machines in the cluster.
+
+```
+uc volume ls [flags]
+```
+
+## Options
+
+```
+  -c, --context string    Name of the cluster context. (default is the current context)
+  -h, --help              help for ls
+  -m, --machine strings   Filter volumes by machine name or ID. Can be specified multiple times or as a comma-separated list. (default is include all machines)
+  -q, --quiet             Only display volume names.
+```
+
+## 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 volume](uc_volume.md)	 - Manage volumes in an Uncloud cluster.
+