agenda: Fix a docstring's position

* lisp/org-agenda.el (org-agenda-remove-filter): Move docstring to
correct position.

lisp/org-agenda.el

@@ -8105,8 +8105,8 @@ grouptags."
        beg end `(invisible org-filtered org-filter-type ,type)))))
 
 (defun org-agenda-remove-filter (type)
-  (interactive)
   "Remove filter of type TYPE from the agenda buffer."
+  (interactive)
   (save-excursion
     (goto-char (point-min))
     (let ((inhibit-read-only t) pos)