org-agenda.el (org-agenda-todo-custom-ignore-p): Fix typo in docstring

* org-agenda.el (org-agenda-todo-custom-ignore-p): Fix typo in docstring.

lisp/org-agenda.el

@@ -5025,7 +5025,7 @@ the documentation of `org-diary'."
     (nreverse ee)))
 
 (defun org-agenda-todo-custom-ignore-p (time n)
-  "Check whether timestamp is farther away then n number of days.
+  "Check whether timestamp is farther away than n number of days.
 This function is invoked if `org-agenda-todo-ignore-deadlines',
 `org-agenda-todo-ignore-scheduled' or
 `org-agenda-todo-ignore-timestamp' is set to an integer."