docs: arm64: Move arm64 documentation under Documentation/arch/

Architecture-specific documentation is being moved into Documentation/arch/
as a way of cleaning up the top-level documentation direct

docs: arm64: Move arm64 documentation under Documentation/arch/

Architecture-specific documentation is being moved into Documentation/arch/
as a way of cleaning up the top-level documentation directory and making
the docs hierarchy more closely match the source hierarchy. Move
Documentation/arm64 into arch/ (along with the Chinese equvalent
translations) and fix up documentation references.

Cc: Will Deacon <[email protected]>
Cc: Alex Shi <[email protected]>
Cc: Hu Haowen <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Reviewed-by: Yantengsi <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

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