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/userland-swsusp.txt b/Documentation/power/userland-swsusp.txt
index 81680f9..1101bee 100644
--- a/Documentation/power/userland-swsusp.txt
+++ b/Documentation/power/userland-swsusp.txt
@@ -98,7 +98,7 @@
 The device's read() operation can be used to transfer the snapshot image from
 the kernel.  It has the following limitations:
 - you cannot read() more than one virtual memory page at a time
-- read()s accross page boundaries are impossible (ie. if ypu read() 1/2 of
+- read()s across page boundaries are impossible (ie. if ypu read() 1/2 of
 	a page in the previous call, you will only be able to read()
 	_at_ _most_ 1/2 of the page in the next call)
 
@@ -137,7 +137,7 @@
 means, such as checksums, to ensure the integrity of the snapshot image.
 
 The suspending and resuming utilities MUST lock themselves in memory,
-preferrably using mlockall(), before calling SNAPSHOT_FREEZE.
+preferably using mlockall(), before calling SNAPSHOT_FREEZE.
 
 The suspending utility MUST check the value stored by SNAPSHOT_CREATE_IMAGE
 in the memory location pointed to by the last argument of ioctl() and proceed
@@ -147,7 +147,7 @@
 	(a)	The suspending utility MUST NOT close the snapshot device
 		_unless_ the whole suspend procedure is to be cancelled, in
 		which case, if the snapshot image has already been saved, the
-		suspending utility SHOULD destroy it, preferrably by zapping
+		suspending utility SHOULD destroy it, preferably by zapping
 		its header.  If the suspend is not to be cancelled, the
 		system MUST be powered off or rebooted after the snapshot
 		image has been saved.