docs: move openrisc 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/openrisc into arch/ and fix all in-tree references.

Cc: Jonas Bonn <[e-mail]>
Cc: Stefan Kristiansson <[e-mail]>
Cc: Stafford Horne <[e-mail]>
Acked-by: Alex Shi <[e-mail]>
Reviewed-by: Yanteng Si <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/arch/index.rst

···
    ../m68k/index
    ../mips/index
    ../nios2/index
-   ../openrisc/index
+   openrisc/index
    ../parisc/index
    ../powerpc/index
    ../riscv/index

Documentation/translations/zh_CN/arch/index.rst

···
    ../mips/index
    ../arm64/index
    ../riscv/index
-   ../openrisc/index
+   openrisc/index
    ../parisc/index
    ../loongarch/index
 

Documentation/translations/zh_CN/openrisc/index.rst Documentation/translations/zh_CN/arch/openrisc/index.rst

···
 .. SPDX-License-Identifier: GPL-2.0
 
-.. include:: ../disclaimer-zh_CN.rst
+.. include:: ../../disclaimer-zh_CN.rst
 
-:Original: Documentation/openrisc/index.rst
+:Original: Documentation/arch/openrisc/index.rst
 
 :翻译:
 

Documentation/translations/zh_CN/openrisc/openrisc_port.rst Documentation/translations/zh_CN/arch/openrisc/openrisc_port.rst

···
-.. include:: ../disclaimer-zh_CN.rst
+.. include:: ../../disclaimer-zh_CN.rst
 
-:Original: Documentation/openrisc/openrisc_port.rst
+:Original: Documentation/arch/openrisc/openrisc_port.rst
 
 :翻译:
 

Documentation/translations/zh_CN/openrisc/todo.rst Documentation/translations/zh_CN/arch/openrisc/todo.rst

···
-.. include:: ../disclaimer-zh_CN.rst
+.. include:: ../../disclaimer-zh_CN.rst
 
-:Original: Documentation/openrisc/todo.rst
+:Original: Documentation/arch/openrisc/todo.rst
 
 :翻译:
 

MAINTAINERS

···
 W:	http://openrisc.io
 T:	git https://github.com/openrisc/linux.git
 F:	Documentation/devicetree/bindings/openrisc/
-F:	Documentation/openrisc/
+F:	Documentation/arch/openrisc/
 F:	arch/openrisc/
 F:	drivers/irqchip/irq-ompic.c
 F:	drivers/irqchip/irq-or1k-*