Fix documentation of torrc search order

We are searching @CONFDIR@ before $HOME, but the documentation
implied otherwise.

I screwed this up in f5e86bcd6c06d43ff3af5acd8135bd8b577bc3, when I
first documented the $HOME/.torrc possibility.

Fix for bug 9213; bugfix on 0.2.3.18-rc.
Merge branch 'bug9213_doc_024' into maint-0.2.4