typo fixes

Most of these fixes were already submitted for old kernel versions, and were
approved, but for some reason they never made it into the releases.

Because this is a consolidation of a couple old missed patches, it touches both
Kconfigs and documentation texts.

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index d8925d2..dd1689b 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -3,7 +3,7 @@
 	option defconfig_list
 	default "arch/$ARCH/defconfig"
 
-# UML uses the generic IRQ sugsystem
+# UML uses the generic IRQ subsystem
 config GENERIC_HARDIRQS
 	bool
 	default y