We don't actually allow a group name, but the documentation implied
that we did.
If set, this option overrides the default location and file name
for Tor's cookie file. (See CookieAuthentication above.)
-[[CookieAuthFileGroupReadable]] **CookieAuthFileGroupReadable** **0**|**1**|__Groupname__::
+[[CookieAuthFileGroupReadable]] **CookieAuthFileGroupReadable** **0**|**1**::
If this option is set to 0, don't allow the filesystem group to read the
cookie file. If the option is set to 1, make the cookie file readable by
the default GID. [Making the file readable by other groups is not yet