docs: Fix broken link to intel 0x80 debug port
Previous link to provide details of `0x80 debug port` is removed, which could no longer be found on intel site [1]. Use snapshot found in web archive [2] to fix this link. Format `debug-port.md` using `mdformat` with GitHub Flavored Markdown (GFM). [1] https://www.intel.com/content/www/us/en/homepage.html [2] https://web.archive.org Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>
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@ -3216,7 +3216,7 @@ enabled by default.
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Based on the Firecracker idea of using a dedicated I/O port to measure guest
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boot times, we added support for logging guest events through the
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[0x80](https://www.intel.com/content/www/us/en/support/articles/000005500/boards-and-kits.html)
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[0x80](https://web.archive.org/web/20211028033025/https://www.intel.com/content/www/us/en/support/articles/000005500/boards-and-kits.html)
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PC debug port. This allows, among other things, for granular guest boot time
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measurements. See our [debug port documentation](docs/debug-port.md) for more
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details.
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