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

Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/arch/index.rst

@@ -22,7 +22,7 @@ implementation.
    ../powerpc/index
    ../riscv/index
    ../s390/index
-   ../sh/index
+   sh/index
    sparc/index
    x86/index
    xtensa/index

MAINTAINERS

@@ -20125,7 +20125,7 @@ M:	John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
 L:	linux-sh@vger.kernel.org
 S:	Maintained
 Q:	http://patchwork.kernel.org/project/linux-sh/list/
-F:	Documentation/sh/
+F:	Documentation/arch/sh/
 F:	arch/sh/
 F:	drivers/sh/
 

arch/sh/Kconfig.cpu

@@ -85,7 +85,7 @@ config CPU_HAS_SR_RB
 	  that are lacking this bit must have another method in place for
 	  accomplishing what is taken care of by the banked registers.
 
-	  See <file:Documentation/sh/register-banks.rst> for further
+	  See <file:Documentation/arch/sh/register-banks.rst> for further
 	  information on SR.RB and register banking in the kernel in general.
 
 config CPU_HAS_PTEAEX