docs: update description on second-instance event. (electron#23119)

diegozhu · zcbenz · loc · web-flow · commit e5fe81ac158c · 2020-04-27T15:21:28.000+09:00
* Update app.md

more descriptions on second-instance event.

* Update docs/api/app.md

Co-Authored-By: loc &lt;andy@slack-corp.com&gt;

Co-authored-by: Cheng Zhao &lt;zcbenz@electronjs.org&gt;
Co-authored-by: loc &lt;andy@slack-corp.com&gt;
diff --git a/docs/api/app.md b/docs/api/app.md
@@ -414,6 +414,8 @@ and `workingDirectory` is its current working directory. Usually
 applications respond to this by making their primary window focused and
 non-minimized.
 
+**Note:** If the second instance is started by a different user than the first, the `argv` array will not include the arguments.
+
 This event is guaranteed to be emitted after the `ready` event of `app`
 gets emitted.
 
