kconfig: mention 'hibernation' not just swsusp

Clarify that "software suspend" is what's called "hibernation" in most user
interfaces, shrinking a terminology gap.  (Examples include Gnome and
MS-Windows.)

Also provide a more succinct description of what it does, so you won't have
to read the whole novel in Kconfig; and highlights just why the lack of
BIOS requirements for swsusp are a big deal.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/power/Kconfig

@@ -78,17 +78,22 @@ config PM_SYSFS_DEPRECATED
 	  are likely to be bus or driver specific.
 
 config SOFTWARE_SUSPEND
-	bool "Software Suspend"
+	bool "Software Suspend (Hibernation)"
 	depends on PM && SWAP && ((X86 && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP))
 	---help---
-	  Enable the suspend to disk (STD) functionality.
+	  Enable the suspend to disk (STD) functionality, which is usually
+	  called "hibernation" in user interfaces.  STD checkpoints the
+	  system and powers it off; and restores that checkpoint on reboot.
 
 	  You can suspend your machine with 'echo disk > /sys/power/state'.
 	  Alternatively, you can use the additional userland tools available
 	  from <http://suspend.sf.net>.
 
 	  In principle it does not require ACPI or APM, although for example
-	  ACPI will be used if available.
+	  ACPI will be used for the final steps when it is available.  One
+	  of the reasons to use software suspend is that the firmware hooks
+	  for suspend states like suspend-to-RAM (STR) often don't work very
+	  well with Linux.
 
 	  It creates an image which is saved in your active swap. Upon the next
 	  boot, pass the 'resume=/dev/swappartition' argument to the kernel to