docs: fix typos and adding more details

subjects/java/checkpoints/todo-list/README.md

@@ -6,7 +6,9 @@ Write a class `Task` that has two attributes: `description` and `status`, with t
 
 Write a class called `TodoList` that represents a to-do list. The class should be able to hold a specified number of tasks, each with a description and a status. Include methods to add tasks, set a task's status, update task descriptions, and display all tasks in a neat format showing their descriptions and statuses.
 
-> The description length will be less or equal to 30 Character.When the list is full nothing more will be added.
+If the index is out of bound nothing happens.
+
+> The description length will be less or equal to 30 character. When the list is full nothing more will be added.
 
 ### Expected Functions