x86: Fix common misspellings

They were generated by 'codespell' and then manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: trivial@kernel.org
LKML-Reference: <1300389856-1099-3-git-send-email-lucas.demarchi@profusion.mobi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/Kconfig.cpu

@@ -326,7 +326,7 @@ config X86_PPRO_FENCE
 	  Old PentiumPro multiprocessor systems had errata that could cause
 	  memory operations to violate the x86 ordering standard in rare cases.
 	  Enabling this option will attempt to work around some (but not all)
-	  occurances of this problem, at the cost of much heavier spinlock and
+	  occurrences of this problem, at the cost of much heavier spinlock and
 	  memory barrier operations.
 
 	  If unsure, say n here. Even distro kernels should think twice before