docs: update Stripe ecommerce tutorial (#24882)
docs: update Stripe ecommerce tutorial (#24882)

* docs: update Stripe ecommerce tutorial

* update copy to make API key / price more explicit

* remove accessibility antipatterns

Co-authored-by: Marcy Sutton <63f38fb7a2c9e72439a06d93cefb66621e8fc496@gatsbyjs.com>
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