Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/parisc/kernel/inventory.c b/arch/parisc/kernel/inventory.c
index d228d82..08324aa 100644
--- a/arch/parisc/kernel/inventory.c
+++ b/arch/parisc/kernel/inventory.c
@@ -93,7 +93,7 @@
 	case 0x6:		/* 705, 710 */
 	case 0x7:		/* 715, 725 */
 	case 0x8:		/* 745, 747, 742 */
-	case 0xA:		/* 712 and similiar */
+	case 0xA:		/* 712 and similar */
 	case 0xC:		/* 715/64, at least */
 
 		pdc_type = PDC_TYPE_SNAKE;