contents/en/documents/2.9: replace frames with ticks

Author: hajimehoshi

contents/en/documents/2.9.html

@@ -142,5 +142,5 @@ <h2>v2.9.1</h2>
 <p><a href="https://github.com/hajimehoshi/ebiten/milestone/146?closed=1">Issues for v2.9.1</a></p>
 <h3>Bug Fixes</h3>
 <ul>
-  <li>Fixed an issue where <code>inpututil.IsKeyJustReleased</code> could return true for multiple consecutive frames even though the key was released only once (<a href="https://github.com/hajimehoshi/ebiten/issues/3326">#3326</a>).</li>
+  <li>Fixed an issue where <code>inpututil.IsKeyJustReleased</code> could return true for multiple consecutive ticks (Update calls) even though the key was released only once (<a href="https://github.com/hajimehoshi/ebiten/issues/3326">#3326</a>).</li>
 </ul>

contents/ja/documents/2.9.html

@@ -142,5 +142,5 @@ <h2>v2.9.1</h2>
 <p><a href="https://github.com/hajimehoshi/ebiten/milestone/146?closed=1">Issues for v2.9.1</a></p>
 <h3>バグ修正</h3>
 <ul>
-  <li>1 回キーを離しただけなのに、 <code>inpututil.IsKeyJustReleased</code> が連続したフレームで true を返すことがあった問題の修正 (<a href="https://github.com/hajimehoshi/ebiten/issues/3326">#3326</a>)。</li>
+  <li>1 回キーを離しただけなのに、 <code>inpututil.IsKeyJustReleased</code> が連続したティック (Update) で true を返すことがあった問題の修正 (<a href="https://github.com/hajimehoshi/ebiten/issues/3326">#3326</a>)。</li>
 </ul>