fix grammar

Author: Violet-Bora-Lee

2-ui/4-forms-controls/2-focus-blur/4-edit-td-click/task.md

@@ -6,7 +6,7 @@ importance: 5
 
 Make table cells editable on click.
 
-- On click -- the cell should became "editable" (textarea appears inside), we can change HTML. There should be no resize, all geometry should remain the same.
+- On click -- the cell should become "editable" (textarea appears inside), we can change HTML. There should be no resize, all geometry should remain the same.
 - Buttons OK and CANCEL appear below the cell to finish/cancel the editing.
 - Only one cell may be editable at a moment. While a `<td>` is in "edit mode", clicks on other cells are ignored.
 - The table may have many cells. Use event delegation.