Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index ec089ac..8edec71 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -122,7 +122,7 @@
 #define H_DABRX_KERNEL		(1UL<<(63-62))
 #define H_DABRX_USER		(1UL<<(63-63))
 
-/* Each control block has to be on a 4K bondary */
+/* Each control block has to be on a 4K boundary */
 #define H_CB_ALIGNMENT          4096
 
 /* pSeries hypervisor opcodes */