Fix grammar mistake

docs/getting-started/gantt-chart-introduction/README.md

@@ -59,7 +59,7 @@ You can change the duration or move the element in the project plan via drag and
 
 ## Edit a project plan
 
-You can edit a project plan by clicking directly in the table and change work package attributes, e.g. Status, Priority or Assignee.
+You can edit a project plan by clicking directly in the table and changing work package attributes, e.g. Status, Priority or Assignee.
 
 To change the start and end date or the duration of a work package, click directly in the Gantt chart and change it via drag and drop.
 All changes will also be tracked in the work packages [Activity](../../user-guide/activity).