Undocumented HS behavior with relative paths
Tor accepts relative paths for HiddenServiceDir...
```
>>> GETCONF HiddenServiceOptions
250-HiddenServiceDir=hidden_service_example
250 HiddenServicePort=80 127.0.0.1:5000
```
This seems to result in the HiddenServiceDir being relative of the tor process' cwd, rather than the DataDir which I kinda expected. This is all well and good, but should be [noted in the manpage](https://www.torproject.org/docs/tor-manual.html.en#HiddenServiceDir).
It's a tiny bit unfortunate that 'GETCONF HidddenServiceOptions' then provides back relative paths, since controllers need to read the HiddenServiceDir to determine the hostname (at least until legacy/trac#1949), but not a terribly big whoop. :)
issue