opthelp for use_inverse

<Someone> (beta) noticed while 3.4.1 was in the process of releasing
that use_inverse wasn't documented in the opthelp.

dat/opthelp

@@ -45,6 +45,7 @@ tombstone      print tombstone when you die                       [TRUE]
 toptenwin      print topten in a window rather than stdout        [FALSE]
 travel         enable the command to travel to a map location via [TRUE]
                a shortest-path algorithm, usually invoked by '_'.
+use_inverse    display detected monsters in highlighted manner    [FALSE]
 verbose        print more commentary during the game              [TRUE]
 
 

doc/fixes35.0

@@ -6,6 +6,7 @@ setmangry should not be called when a monster enters a bones region
 avoid panic when secondary weapon is cursed while generating bones level
 typos fixed in data.base
 bad capitalization of msg when charging for something that catches light
+missing opthelp for use_inverse
 
 
 Platform- and/or Interface-Specific Fixes