Revert "add a "docs" to the manual URI as listed in torrc.sample.in"

This reverts commit 55e8cae815.

The conversation from irc:
> weasel: i had intended to leave torrc.sample.in alone in maint-0.2.2,
since i don't want to make all your stable users have to deal with
a torrc change. but nickm changed it. is it in fact the case that a
change in that file means a change in the deb?
<weasel> it means you'll prompt every single user who ever touched
their torrc
<weasel> and they will be asked if they like your new version better
than what they have right now
<weasel> so it's not great

Instead I changed the website to redirect requests for the tor-manual
URL listed in maint-0.2.2's torrc.sample.in so the link will still work.

changes/manual_uri_in_torrc

@@ -1,3 +0,0 @@
-  o Minor bugfixes (documentation):
-   - Fix the URL for the online version of the manual that's listed in
-     torrc.sample.

src/config/torrc.sample.in

@@ -6,7 +6,7 @@
 ## that begin with just "#" are disabled commands: you can enable them
 ## by removing the "#" symbol.
 ##
-## See 'man tor', or https://www.torproject.org/docs/tor-manual.html,
+## See 'man tor', or https://www.torproject.org/tor-manual.html,
 ## for more options you can use in this file.
 ##
 ## Tor will look for this file in various places based on your platform: