Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index d1d484d..f703b28 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -241,7 +241,7 @@
 	case CPER_SEV_FATAL:
 		return GHES_SEV_PANIC;
 	default:
-		/* Unkown, go panic */
+		/* Unknown, go panic */
 		return GHES_SEV_PANIC;
 	}
 }