make AuthDirHasIPv6Connectivity match the man page

we can turn it into an autobool later if we have some way for it
to make a decision.

(patch possibly got lost when nickm merged #6770; or maybe nickm meant
for it to be this way. i'm not sure.)

src/or/config.c

@@ -204,7 +204,7 @@ static config_var_t _option_vars[] = {
   V(AuthDirListBadExits,         BOOL,     "0"),
   V(AuthDirMaxServersPerAddr,    UINT,     "2"),
   V(AuthDirMaxServersPerAuthAddr,UINT,     "5"),
-  V(AuthDirHasIPv6Connectivity,  AUTOBOOL, "0"),
+  V(AuthDirHasIPv6Connectivity,  BOOL,     "0"),
   VAR("AuthoritativeDirectory",  BOOL, AuthoritativeDir,    "0"),
   V(AutomapHostsOnResolve,       BOOL,     "0"),
   V(AutomapHostsSuffixes,        CSV,      ".onion,.exit"),

src/or/or.h

@@ -3323,7 +3323,7 @@ typedef struct {
   int AuthDirMaxServersPerAuthAddr; /**< Do not permit more than this
                                      * number of servers per IP address shared
                                      * with an authority. */
-  int AuthDirHasIPv6Connectivity; /**< Autoboolean: are we on IPv6?  */
+  int AuthDirHasIPv6Connectivity; /**< Boolean: are we on IPv6?  */
 
   /** If non-zero, always vote the Fast flag for any relay advertising
    * this amount of capacity or more. */