samples/kobject: fix path comment

The introductory comment still says the example creates
/sys/kernel/kobject-example, but the code actually creates
/sys/kernel/kobject_example.

Update both comments to reflect the actual sysfs paths. Also,
fix "tree"->"three" typo in kset-example.c.

Signed-off-by: Meng Shao Liu <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

samples/kobject/kobject-example.c

···
 
 /*
  * This module shows how to create a simple subdirectory in sysfs called
- * /sys/kernel/kobject-example  In that directory, 3 files are created:
+ * /sys/kernel/kobject_example  In that directory, 3 files are created:
  * "foo", "baz", and "bar".  If an integer is written to these files, it can be
  * later read out of it.
  */

samples/kobject/kset-example.c

···
 
 /*
  * This module shows how to create a kset in sysfs called
- * /sys/kernel/kset-example
- * Then tree kobjects are created and assigned to this kset, "foo", "baz",
+ * /sys/kernel/kset_example
+ * Then three kobjects are created and assigned to this kset, "foo", "baz",
  * and "bar".  In those kobjects, attributes of the same name are also
  * created and if an integer is written to these files, it can be later
  * read out of it.