docs: do not document CT_KERNEL_ARCH, it's going away...
Since we merged the 32/64-bit archs, and we explicitly used
the Linux kernel arch name, we can get rid of CT_KERNEL_ARCH.
1 # s390 specific config options
2 # depends on EXPERIMENTAL
5 select ARCH_SUPPORTS_32
6 select ARCH_SUPPORTS_64
9 select ARCH_SUPPORT_FPU
12 32-bit ESA/390 : http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/dz9ar008/CCONTENTS
13 64-bit z/Architecure : http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/dz9zr002/CCONTENTS