Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/Documentation/power/notifiers.txt b/Documentation/power/notifiers.txt
index ae1b7ec..cf98070 100644
--- a/Documentation/power/notifiers.txt
+++ b/Documentation/power/notifiers.txt
@@ -24,7 +24,7 @@
 			be frozen immediately.
 
 PM_POST_HIBERNATION	The system memory state has been restored from a
-			hibernation image or an error occured during the
+			hibernation image or an error occurred during the
 			hibernation.  Device drivers' .resume() callbacks have
 			been executed and tasks have been thawed.
 
@@ -38,7 +38,7 @@
 
 PM_SUSPEND_PREPARE	The system is preparing for a suspend.
 
-PM_POST_SUSPEND		The system has just resumed or an error occured during
+PM_POST_SUSPEND		The system has just resumed or an error occurred during
 			the suspend.	Device drivers' .resume() callbacks have
 			been executed and tasks have been thawed.