fix typo

Co-authored-by: Daisuke Yamamura <mucho613@gmail.com>

Author: Fukusan64

index.html

@@ -300,7 +300,7 @@ <h2 class="text-4xl mt-20 sm:mt-32 xl:mt-60 2xl:mt-40 text-center">
     <li class="text-sm flex items-center py-4 flex-wrap sm:flex-nowrap gap-y-1">
       <time class="block min-w-24">2025.08.02</time>
       <span class="block min-w-24 text-center mr-6 px-4 py-px rounded-xs bg-[#cc8f2e] text-white">お知らせ</span>
-      <a href="/sponsorship/index.html" class="ml-2 hover:underline">DojoCon 2025 スポンサー募集のお知らせを掲載しました</a>
+      <a href="/sponsorship/index.html" class="ml-2 hover:underline">DojoCon Japan 2025 スポンサー募集のお知らせを掲載しました</a>
     </li>
     <li class="text-sm flex items-center py-4 flex-wrap sm:flex-nowrap gap-y-1">
       <time class="block min-w-24">2025.07.21</time>