Merge branch 'msj-quick-actions-doc' into 'master'

Reword a sentence in quick actions doc

See merge request gitlab-org/gitlab!20531

doc/user/project/quick_actions.md

@@ -8,9 +8,9 @@ Quick actions are textual shortcuts for common actions on issues, epics, merge r
 and commits that are usually done by clicking buttons or dropdowns in GitLab's UI.
 You can enter these commands while creating a new issue or merge request, or
 in comments of issues, epics, merge requests, and commits. Each command should be
-on a separate line in order to be properly detected and executed. Once executed,
+on a separate line in order to be properly detected and executed.
 
-> From [GitLab 12.1](https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/26672), an alert is displayed when a quick action is successfully applied.
+> From [GitLab 12.1](https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/26672), once an action is executed, an alert is displayed when a quick action is successfully applied.
 
 ## Quick Actions for issues, merge requests and epics