modify emitter relative_install_dir

Signed-off-by: Nzengsiyu <zengsiyu3@huawei.com>
Change-Id: I5b52ec7daee803bc7381ce7ad25a62bfba260336

zh-cn/application-dev/reference/apis/js-apis-emitter.md

@@ -5,7 +5,7 @@
 ## 导入模块
 
 ```javascript
-import emitter from '@ohos.emitter'
+import emitter from '@ohos.events.emitter'
 ```
 
 ## 权限列表