docs: add description to commands and index page

docs/content/commands/rclone_backend.md

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+---
+date: 2020-05-18T10:38:09+01:00
+title: "rclone backend"
+description: "Run a backend specific command."
+slug: rclone_backend
+url: /commands/rclone_backend/
+# autogenerated - DO NOT EDIT, instead edit the source code in cmd/backend/ and as part of making a release run "make commanddocs"
+---
+## rclone backend
+
+Run a backend specific command.
+
+### Synopsis
+
+
+This runs a backend specific command. The commands themselves (except
+for "help" and "features") are defined by the backends and you should
+see the backend docs for definitions.
+
+You can discover what commands a backend implements by using
+
+    rclone backend help remote:
+    rclone backend help <backendname>
+
+You can also discover information about the backend using (see
+[operations/fsinfo](/rc/#operations/fsinfo) in the remote control docs
+for more info).
+
+    rclone backend features remote:
+
+Pass options to the backend command with -o. This should be key=value or key, eg:
+
+    rclone backend stats remote:path stats -o format=json -o long
+
+Pass arguments to the backend by placing them on the end of the line
+
+    rclone backend cleanup remote:path file1 file2 file3
+
+Note to run these commands on a running backend then see
+[backend/command](/rc/#backend/command) in the rc docs.
+
+
+```
+rclone backend <command> remote:path [opts] <args> [flags]
+```
+
+### Options
+
+```
+  -h, --help                 help for backend
+      --json                 Always output in JSON format.
+  -o, --option stringArray   Option in the form name=value or name.
+```
+
+See the [global flags page](/flags/) for global options not listed here.
+
+### SEE ALSO
+
+* [rclone](/commands/rclone/)	 - Show help for rclone commands, flags and backends.
+