web: fix bad comment that was confusing lit-analyze (#7234)

The old comment was left over from a previous revision of the wizard, and
blocked lit-analyze's ability to understand the Modal's `slot="trigger"`
declaration.

web/src/components/ak-wizard-main/ak-wizard-frame.ts

@@ -22,7 +22,7 @@ import { type WizardButton, WizardStepLabel } from "./types";
  *
  * @element ak-wizard-frame
  *
- * @slot - Where the form itself should go
+ * @slot trigger - (Inherited from ModalButton) Define the "summon modal" button here
  *
  * @fires ak-wizard-nav - Tell the orchestrator what page the user wishes to move to.
  *