Remove the clean_map option.

It didn't have a very clear use case and if you really want to
reproduce it, you can press ^C every so often.

Also clean up the options documentation a bit.

1 files changed, 3 insertions, 4 deletions

diff --git a/crawl-ref/source/show.cc b/crawl-ref/source/show.cc
index df57ef2e67..2a5cf921b4 100644
--- a/crawl-ref/source/show.cc
+++ b/crawl-ref/source/show.cc
@@ -103,10 +103,9 @@ bool show_type::operator < (const show_type &other) const
     }
 }
 
-// Returns true if this is a monster that can be hidden for clean_map
-// purposes. All non-immobile monsters are hidden when out of LOS with
-// Options.clean_map, or removed from the map when the clear-map
-// command (^C) is used.
+// Returns true if this is a monster that can be hidden for ^C
+// purposes. All non-immobile monsters are removed from the map
+// when the clear-map command (^C) is used.
 bool show_type::is_cleanable_monster() const
 {
     return cls == SH_MONSTER && !mons_class_is_stationary(mons);