x86/Kconfig: Correct spelling and punctuation

End a sentence with a period (aka full stop) in Kconfig help text. Fix
minor NUMA-related Kconfig text:

- Use capital letters for NUMA acronym.
- Hyphenate Non-Uniform.

 [ bp: Merge into a single patch. ]

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: X86 ML <x86@kernel.org>
Link: https://lkml.kernel.org/r/443ed0a8-783d-6c7c-3258-e1c44df03fd7@infradead.org