fix: watchEffect api links (vuejs#443)

Author: Eduard Aksamitov

src/api/computed-watch-api.md

@@ -127,7 +127,7 @@ watch([fooRef, barRef], ([foo, bar], [prevFoo, prevBar]) => {
 
 ### Shared Behavior with `watchEffect`
 
-`watch` shares behavior with [`watchEffect`](#watcheffect) in terms of [manual stoppage](#stopping-the-watcher), [side effect invalidation](#side-effect-invalidation) (with `onInvalidate` passed to the callback as the 3rd argument instead), [flush timing](#effect-flush-timing) and [debugging](#watcher-debugging).
+`watch` shares behavior with [`watchEffect`](#watcheffect) in terms of [manual stoppage](../guide/reactivity-computed-watchers.html#stopping-the-watcher), [side effect invalidation](../guide/reactivity-computed-watchers.html#side-effect-invalidation) (with `onInvalidate` passed to the callback as the 3rd argument instead), [flush timing](../guide/reactivity-computed-watchers.html#effect-flush-timing) and [debugging](../guide/reactivity-computed-watchers.html#watcher-debugging).
 
 **Typing:**