PM / Hibernate: Fix typo in a kerneldoc comment

Fix a typo in a function name in the kerneldoc comment next to
resume_target_kernel().

[rjw: Changed the subject slightly, added the changelog.]

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 3a20466..7f44e5c 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -467,7 +467,7 @@
  * @platform_mode: If set, use platform driver to prepare for the transition.
  *
  * This routine must be called with pm_mutex held.  If it is successful, control
- * reappears in the restored target kernel in hibernation_snaphot().
+ * reappears in the restored target kernel in hibernation_snapshot().
  */
 int hibernation_restore(int platform_mode)
 {