Update service

service.md

@@ -90,7 +90,7 @@ The Service Admins maintain the following list of Tor Services.
 | [survey][]         | survey application                                        | <https://survey.torproject.org/>    | hiro                                   | 1%         |
 | [svn][]            | Document storage                                          | <https://svn.torproject.org/>       | unmaintained                           | 10%        |
 | [website][]        | main website                                              | <https://www.torproject.org>        | hiro                                   | ?          |
-| [btcpayserver][] | BTCpayserver | <https://btcpay.torproject.net/> | hiro, asn, sue| 90% |
+| [btcpayserver](service/BTCpayserver) | BTCpayserver | <https://btcpay.torproject.net/> | hiro, asn, sue| 90% |
 
 Every service listed here must have some documentation, ideally
 following the [documentation template](howto/template). As a courtesy,