docs: move xtensa documentation under Documentation/arch/

2023-03-30T19:00:22Z

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/xtensa into arch/ and fix all in-tree references. Cc: Chris Zankel Reviewed-by: Max Filippov Signed-off-by: Jonathan Corbet

kernel.git/Documentation/arch/xtensa, branch linux-6.4.y

docs: move xtensa documentation under Documentation/arch/