Refactor image tags in amethyst-ios.mdx

Updated image tags to self-closing format in the installation instructions for Dopamine.

Author: Rapid-carbon-neutralization

src/content/docs/java/process/mobile-player/client/amethyst-ios.mdx

@@ -336,9 +336,9 @@ import { Steps } from "@astrojs/starlight/components";
 
 2.打开 Dopamine ，点击越狱按钮，选择包管理器为 Sideo ，设置 root 密码
 
-  <img src="/_astro/Dopamine_1.hkO75Pru_ZzMUaG.webp" alt="Dopamine 步骤1" width="1242" height="2208"><br>
-  <img src="/_astro/Dopamine_2.CCsNjsFe_Zci7mt.webp" alt="Dopamine 步骤2" width="1242" height="2208"><br>
-  <img src="/_astro/Dopamine_3.BzMPkPxG_K0sMr.webp" alt="Dopamine 步骤3" width="1242" height="2208">
+  <img src="/_astro/Dopamine_1.hkO75Pru_ZzMUaG.webp" alt="Dopamine 步骤1" width="1242" height="2208" /><br />
+  <img src="/_astro/Dopamine_2.CCsNjsFe_Zci7mt.webp" alt="Dopamine 步骤2" width="1242" height="2208" /><br />
+  <img src="/_astro/Dopamine_3.BzMPkPxG_K0sMr.webp" alt="Dopamine 步骤3" width="1242" height="2208" />
 
 3.从此 [链接](https://github.com/AngelAuraMC/Amethyst-iOS/actions) 下载 Amethyst 的 ipa 安装包。**（需要使用 GitHub 账号才能继续下载）**