docs: remove unused onAddTask prop from AddTask component

Author: wo-o29

src/content/learn/managing-state.md

@@ -890,7 +890,7 @@ const initialTasks = [
 import { useState, useContext } from 'react';
 import { useTasksDispatch } from './TasksContext.js';
 
-export default function AddTask({ onAddTask }) {
+export default function AddTask() {
   const [text, setText] = useState('');
   const dispatch = useTasksDispatch();
   return (

src/content/learn/scaling-up-with-reducer-and-context.md

@@ -696,7 +696,7 @@ export default function TaskList() {
 `tasks` 리스트를 업데이트하기 위해서 컴포넌트에서 context의 `dispatch` 함수를 읽고 호출할 수 있습니다.
 
 ```js {3,9-13}
-export default function AddTask({ onAddTask }) {
+export default function AddTask() {
   const [text, setText] = useState('');
   const dispatch = useContext(TasksDispatchContext);
   // ...
@@ -785,7 +785,7 @@ export const TasksDispatchContext = createContext(null);
 import { useState, useContext } from 'react';
 import { TasksDispatchContext } from './TasksContext.js';
 
-export default function AddTask({ onAddTask }) {
+export default function AddTask() {
   const [text, setText] = useState('');
   const dispatch = useContext(TasksDispatchContext);
   return (