Add some missing iframe attributes

[nojaf]

This is the snippet you get when you want to embed a YouTube video.

[pkg-pr-new]

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rescript

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@rescript/darwin-arm64

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@rescript/darwin-x64

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@rescript/linux-arm64

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@rescript/linux-x64

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@rescript/runtime

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@rescript/win32-x64

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commit: 0af605c