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/Documentation/Changes b/Documentation/Changes
index abee7f5..73a8617 100644
--- a/Documentation/Changes
+++ b/Documentation/Changes
@@ -201,7 +201,7 @@
 ----
 udev is a userspace application for populating /dev dynamically with
 only entries for devices actually present.  udev replaces the basic
-functionality of devfs, while allowing persistant device naming for
+functionality of devfs, while allowing persistent device naming for
 devices.
 
 FUSE
diff --git a/Documentation/power/states.txt b/Documentation/power/states.txt
index 3e5e5d3..0931a33 100644
--- a/Documentation/power/states.txt
+++ b/Documentation/power/states.txt
@@ -62,7 +62,7 @@
 inconvenience, this method requires minimal work by the kernel, since
 the firmware will also handle restoring memory contents on resume. 
 
-If the kernel is responsible for persistantly saving state, a mechanism 
+If the kernel is responsible for persistently saving state, a mechanism
 called 'swsusp' (Swap Suspend) is used to write memory contents to
 free swap space. swsusp has some restrictive requirements, but should
 work in most cases. Some, albeit outdated, documentation can be found