change default for 'autodescribe' to 'on'

This was discussed two years ago then nothing happened.  Make
autodescribe for feedback when moving the cursor to pick something
default to on instead of off.

doc/Guidebook.mn

@@ -2601,7 +2601,8 @@ exclude that alignment from being picked randomly.
 Cannot be set with the `O' command.  Persistent.
 .lp autodescribe
 Automatically describe the terrain under cursor when asked to get a location
-on the map.  The
+on the map (default true).
+The
 .op whatis_coord
 option controls whether the description includes map coordinates.
 .lp autodig

doc/Guidebook.tex

@@ -3038,8 +3038,8 @@ Cannot be set with the `{\tt O}' command.  Persistent.
 %.lp
 \item[\ib{autodescribe}]
 Automatically describe the terrain under cursor when asked to get a location
-on the map.  The
-{\it whatis\verb+_+coord\/}
+on the map (default true).
+The {\it whatis\verb+_+coord\/}
 option controls whether the description includes map coordinates.
 %.lp
 \item[\ib{autodig}]

doc/fixes36.2

@@ -157,6 +157,7 @@ floating eye is classified as a flyer but flying is blocked while levitating,
 being trapped (bear trap, web, molten or solidified lava, chained to buried
 	iron ball) blocks both levitation and flight (note: being stuck in a
 	pit ends when either of those starts so doesn't apply)
+change default value for the 'autodescribe' option to 'on'
 
 
 Fixes to Post-3.6.1 Problems that Were Exposed Via git Repository

src/options.c

@@ -78,7 +78,7 @@ static struct Bool_Opt {
 #else
     { "asksavedisk", (boolean *) 0, FALSE, SET_IN_FILE },
 #endif
-    { "autodescribe", &iflags.autodescribe, FALSE, SET_IN_GAME },
+    { "autodescribe", &iflags.autodescribe, TRUE, SET_IN_GAME },
     { "autodig", &flags.autodig, FALSE, SET_IN_GAME },
     { "autoopen", &flags.autoopen, TRUE, SET_IN_GAME },
     { "autopickup", &flags.pickup, TRUE, SET_IN_GAME },