(todo-insert-threshold): Fix spellings in docstrings.

diff --git a/lisp/calendar/todo-mode.el b/lisp/calendar/todo-mode.el
index 132f42369c64d480186be72df84719bcff7147f0..85d49ba38f768700f5972f8ede2a2e70e824a260 100644 (file)
--- a/lisp/calendar/todo-mode.el
+++ b/lisp/calendar/todo-mode.el
@@ -311,7 +311,7 @@ which it will stop.  If you set the threshhold to zero, the upper and
 lower bound will coincide at the end of the loop and you will insert
 your item just before that point.  If you set the threshhold to,
 e.g. 8, it will stop as soon as the window size drops below that
-amount and will insert the item in the approximate centre of that
+amount and will insert the item in the approximate center of that
 window."
   :type 'integer
   :group 'todo)