minor fixes

- bitcoind: Remove obsolete defaultText
- clightning: Fix description
  Option `address` can't be used to specify a socket path because it's
  used explicitly as an IP address in many places.
- lnd: Break up overlong line
  This is required by commit `services: support 0.0.0.0/:: in `address` options`
- nix-bitcoin.nix: Formatting
- secrets: Improve descriptions

modules/nix-bitcoin.nix

@@ -16,7 +16,7 @@ with lib;
 
       torClientAddressWithPort = mkOption {
         readOnly = true;
-        default =  with config.services.tor.client.socksListenAddress;
+        default = with config.services.tor.client.socksListenAddress;
           "${addr}:${toString port}";
       };