add instruct for online embed module

[ChenJiahaoST]

📌 PR 内容 / PR Description

🔍 相关 Issue / Related Issue

✅ 变更类型 / Type of Change

• 修复 Bug / Bug fix (non-breaking change that fixes an issue)
• 新功能 / New feature (non-breaking change that adds functionality)
• 重构 / Refactor (no functionality change, code structure optimized)
• 重大变更 / Breaking change (fix or feature that would cause existing functionality to change)
• 文档更新 / Documentation update (changes to docs only)

🧪 如何测试 / How Has This Been Tested?

📷 截图 / Demo (Optional)

⚡ 更新后的用法示例 / Usage After Update

# 示例 / Example

🔄 重构前 / 重构后对比 (仅当 Type 为 Refactor) / Refactor Before & After (only for Refactor)

重构前 / Before:

重构后 / After:

⚠️ 注意事项 / Additional Notes