Update HiddenServiceVersion in tor.1.txt to only allow one of the HS version 2 or 3
The current `HiddenServiceVersion` man page entry for `tor` is: ``` [[HiddenServiceVersion]] **HiddenServiceVersion** __version__,__version__,__...__:: ``` Which reads like the config entry takes a list of version where in reality it only accept either 2 or 3.
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