x86: doc: move x86-generic documentation from Doc/x86/i386
The boot protocol, USB legacy support, and zero-page documentation is
common to the x86 platform, not i386-specific.
Signed-off-by: 
H. Peter Anvin <hpa@zytor.com>
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The boot protocol, USB legacy support, and zero-page documentation is
common to the x86 platform, not i386-specific.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>