doc: fix broken link in timers doc

PR-URL: https://github.com/nodejs/node/pull/8562
Reviewed-By: Yorkie Liu <yorkiefixer@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Prince John Wesley <princejohnwesley@gmail.com>

doc/api/timers.md

@@ -19,7 +19,7 @@ actions.
 ## Class: Timeout
 
 This object is created internally and is returned from [`setTimeout()`][] and
-[`setInterval()`][]. It can be passed to [`clearTimeout`][] or
+[`setInterval()`][]. It can be passed to [`clearTimeout()`][] or
 [`clearInterval()`][] (respectively) in order to cancel the scheduled actions.
 
 By default, when a timer is scheduled using either [`setTimeout()`][] or