ControlPort's section on flags wasn't indented

Minor formatting issue with our ControlPort entry. The part about flags wasn't
indented with the rest of its description.

doc/tor.1.txt

@@ -289,9 +289,9 @@ GENERAL OPTIONS
     any process on the local host to control it. (Setting both authentication
     methods means eithermethod is sufficient to authenticate to Tor.) This
     option is required for many Tor controllers; most use the value of 9051.
-    Set it to "auto" to have Tor pick a port for you. (Default: 0)
+    Set it to "auto" to have Tor pick a port for you. (Default: 0) +
  +
-    Recognized flags are::
+    Recognized flags are...
     **GroupWritable**;;
         Unix domain sockets only: makes the socket get created as
         group-writable.