Fix tiny spelling mistake.

lisp/org-clock.el

@@ -1422,7 +1422,7 @@ If there is no running clock, throw an error, unless FAIL-QUIETLY is set."
   (org-clock-timestamps-change 'down))
 
 (defun org-clock-timestamps-change (updown)
-  "Change CLOCK timestamps synchronuously at cursor.
+  "Change CLOCK timestamps synchronously at cursor.
 UPDOWN tells whether to change 'up or 'down."
   (setq org-ts-what nil)
   (when (org-at-timestamp-p t)

lisp/org.el

@@ -17544,7 +17544,7 @@ Depending on context, this does one of the following:
    (t (org-shiftselect-error))))
 
 (defun org-shiftcontrolup ()
-  "Change timestamps synchronuously up in CLOCK log lines."
+  "Change timestamps synchronously up in CLOCK log lines."
   (interactive)
   (cond ((and (not org-support-shift-select)
 	      (org-at-clock-log-p))
@@ -17552,7 +17552,7 @@ Depending on context, this does one of the following:
 	(t (org-shiftselect-error))))
 
 (defun org-shiftcontroldown ()
-  "Change timestamps synchronuously down in CLOCK log lines."
+  "Change timestamps synchronously down in CLOCK log lines."
   (interactive)
   (cond ((and (not org-support-shift-select)
 	      (org-at-clock-log-p))