Add note about ACPI -> Quirks > NormalizeHeaders for macOS High Sierra

#### Guide(s) in question: [OpenCore Install Guide](https://dortania.github.io/OpenCore-Install-Guide/)

#### Link to page(s) with the issue: [Laptop Skylake config.plist](https://dortania.github.io/OpenCore-Install-Guide/config-laptop.plist/skylake.html)

#### Clearly explain the issue(s) with the page(s) (if there is a visual issue, a screenshot is required):

According to [OpenCore Configuration](https://raw.githubusercontent.com/acidanthera/OpenCorePkg/master/Docs/Configuration.pdf), `NormalizeHeaders` is (maybe) required for macOS High Sierra to boot: `Cleanup ACPI header fields to workaround macOS ACPI implementation flaws that result in boot crashes. The issue was fixed in macOS Mojave (10.14)`

In my case, following the current guide, I would be able to get Sierra, Mojave to Monterey, but not High Sierra. Changing `NormalizeHeaders` to `True` when booting High Sierra fixes that.

#### Include possible fixes
Add note about ACPI -> Quirks > NormalizeHeaders for macOS High Sierra: `True`