Fix typos in doc and comments

Changes persistant -> persistent. www.dictionary.com does not know
persistant (with an A), but should it be one of those things you can
spell in more than one correct way, let me know.

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/fs/Kconfig b/fs/Kconfig
index 8bec76b..b3b5aa0 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -972,7 +972,7 @@
 
 	Some system agents rely on the information in sysfs to operate.
 	/sbin/hotplug uses device and object attributes in sysfs to assist in
-	delegating policy decisions, like persistantly naming devices.
+	delegating policy decisions, like persistently naming devices.
 
 	sysfs is currently used by the block subsystem to mount the root
 	partition.  If sysfs is disabled you must specify the boot device on