Drop stale comment about not applying credit at booking

This change applies credit at booking for scheduled rebooks, so the note
saying the pay-now flow deliberately does not was contradictory.

Co-authored-by: anthropic/claude-opus-4-8

src/Booking/LessonBooker.php

@@ -198,13 +198,11 @@ class LessonBooker {
 
 			// A scheduled lesson charged at booking — the extra lesson added to (or a
 			// cancelled one rebooked within) an already-billed month — skips the daily
-			// scan, which is the only place credit is otherwise applied. Apply the
+			// scan, so apply the payer's account credit here too. A cancellation credit
-			// payer's account credit here too, so a cancellation credit settles the
+			// then settles the rebooking instead of the family being charged twice for
-			// rebooking instead of the family being charged twice for the same slot. A
+			// the same slot. A pending payment fully covered by credit is settled and
-			// pending payment fully covered by credit is settled and its lesson
+			// its lesson confirmed; applyCredits is a no-op when the payer holds no
-			// confirmed; applyCredits is a no-op when the payer holds no balance. The
+			// balance.
-			// one-time pay-now flow is left alone: its payment step already fronts the
-			// student, and credit there is a manual studio decision.
 			if ( $offering->isScheduledBilling() && null !== $payment && null !== $payment->id && Payment::STATUS_PENDING === $payment->status ) {
 				$this->payments->applyCredits( $payerId, [ $payment ] );
 				$payment = $this->payments->findPayment( (int) $payment->id ) ?? $payment;