PM: sleep: wakeup: Fix typos in comments

Remove the second 'the'.
Replace the second 'of' with 'the'.
Replace 'couter' with 'counter'.

Signed-off-by: Tom Rix <trix@redhat.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>