x86: Fix various typos in comments

Go over arch/x86/ and fix common typos in comments,
and a typo in an actual function argument name.

No change in functionality intended.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index db7a100..c353a0f 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1704,7 +1704,7 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
 	} else if (!(in_flag & CPA_PAGES_ARRAY)) {
 		/*
 		 * in_flag of CPA_PAGES_ARRAY implies it is aligned.
-		 * No need to cehck in that case
+		 * No need to check in that case
 		 */
 		if (*addr & ~PAGE_MASK) {
 			*addr &= PAGE_MASK;