update /doc directory with latest from leap docs/platform

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+@title = 'tor'
+@summary = 'Tor exit node or hidden service'
+
+Topology
+------------------------
+
+Nodes with `tor` service will run a Tor exit or hidden service, depending on what other service it is paired with:
+
+* `tor` + `openvpn`: when combined with `openvpn` nodes, `tor` will create a Tor exit node to provide extra cover traffic for the VPN. This can be especially useful if there are VPN gateways without much traffic.
+* `tor` + `webapp`: when combined with a `webapp` node, the `tor` service will make the webapp and the API available via .onion hidden service.
+* `tor` stand alone: a regular Tor exit node.
+
+If activated, you can list the hidden service .onion addresses this way:
+
+   leap ls --print tor.hidden_service.address tor
+
+Then just add '.onion' to the end of the printed addresses.
+
+Configuration
+------------------------------
+
+* `tor.bandwidth_rate`: the max bandwidth allocated to Tor, in KB per second, when used as an exit node.
+
+For example:
+
+    {
+      "tor": {
+        "bandwidth_rate": 6550
+      }
+    }
+
+