kernel: update SCHED_CPU_MASK Kconfig doc

	bool "Enable CPU mask affinity/pinning API"

	depends on SCHED_DUMB

	help

	  When true, the app will have access to the

	  z_thread_*_cpu_mask() APIs which control per-CPU affinity

	  masks in SMP mode, allowing apps to pin threads to specific

	  CPUs or disallow threads from running on given CPUs.  Note

	  that as currently implemented, this involves an inherent

	  O(N) scaling in the number of idle-but-runnable threads, and

	  thus works only with the DUMB scheduler (as SCALABLE and

	  MULTIQ would see no benefit).

	  Note that this setting does not technically depend on SMP

	  and is implemented without it for testing purposes, but for

	  obvious reasons makes sense as an application API only where

	  there is more than one CPU.  With one CPU, it's just a

	  higher overhead version of k_thread_start/stop().

	  When true, the application will have access to the

	  k_thread_cpu_mask_*() APIs which control per-CPU affinity masks in

	  SMP mode, allowing applications to pin threads to specific CPUs or

	  disallow threads from running on given CPUs.  Note that as currently

	  implemented, this involves an inherent O(N) scaling in the number of

	  idle-but-runnable threads, and thus works only with the DUMB

	  scheduler (as SCALABLE and MULTIQ would see no benefit).

	  Note that this setting does not technically depend on SMP and is

	  implemented without it for testing purposes, but for obvious reasons

	  makes sense as an application API only where there is more than one

	  CPU.  With one CPU, it's just a higher overhead version of

	  k_thread_start/stop().

config MAIN_STACK_SIZE

	int "Size of stack for initialization and main thread"