docs: fix screen reader output example for accessible tab component

[JeongHwan-dev]

📝 Key Changes

Fix incorrect "selected" state display in screen reader output example

What's Fixed

• Updated screen reader output to show "selected" state on the correct tab (Feed)
• Ensured consistency between code example and screen reader output

Problem Solved

The code example shows Feed tab with aria-selected={true}, but the screen reader output example incorrectly showed "selected" state on Home tab instead.

🖼️ Before and After Comparison

Code Example:

<div role="tablist" aria-label="메뉴">
  <button role="tab" aria-selected={false}>
    홈
  </button>
  <button role="tab" aria-selected={false}>
    관심
  </button>
  <button role="tab" aria-selected={false}>
    발견
  </button>
  <button role="tab" aria-selected={true}>
    피드
  </button>
</div>

Before (Incorrect output):
메뉴, 탭 목록
홈, 선택됨, 탭 ← ❌ Incorrect
관심, 탭
발견, 탭
피드, 탭

After (Correct output):
메뉴, 탭 목록
홈, 탭
관심, 탭
발견, 탭
피드, 선택됨, 탭 ← ✅ Correct

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