Fix a double "for" in manual (#409)

mw.1

@@ -56,7 +56,7 @@ Neither
 .B delete
 or
 .B purge
-will delete downloaded mail for for safety (and time)'s sake. If you want to delete downloaded mail, do so manually by removing it from the directory above.
+will delete downloaded mail for safety (and time)'s sake. If you want to delete downloaded mail, do so manually by removing it from the directory above.
 .TP
 .B Default settings
 The mutt-wizard has many default settings that focus on making it aesthetically pleasing and supplying more vim-like bindings. These can be found in