[CATALYST-1739] - Clarify Express Wallet Button Support (#1248)

<!-- Ticket number or summary of work -->
[CATALYST-1739]


## What changed?
Clarify support for Express Wallet Buttons in Catalyst

## Release notes draft
n/a


## Anything else?
n/a

ping {names}


[CATALYST-1739]:
https://bigcommercecloud.atlassian.net/browse/CATALYST-1739?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: jamesqquick

docs/storefront/catalyst/features/features.mdx

@@ -34,6 +34,7 @@ Below is a list of major BigCommerce platform features, detailing what support e
 | Visual Editing (Page Builder equivalent) | 🟢 | As of 1.0 Makeswift is deeply integrated into Catalyst on a distributable version of Catalyst; customers have the choice of either using Makeswift or selecting a version of Catalyst with no editor built in. |
 | Wishlists | 🟢 | [Wishlist Catalyst documentation](/docs/storefront/catalyst/reference/wishlists) |
 | Out of Stock Messages | 🟢 |Added in [Catalyst 1.4](/docs/storefront/catalyst/release-notes/1-4-0) |
+| Express Wallet Buttons | 🟡 | Not directly supported in Catalyst (for example, on the Cart page). Express wallet buttons do work on Checkout, which is rendered by Stencil rather than Catalyst. |
 | [B2B Open Source Buyer Portal](https://github.com/bigcommerce/b2b-buyer-portal) | 🟡 | There is an **experimental** integration available. See the [Catalyst + B2B Buyer Portal](/docs/storefront/catalyst/experiments/b2b) guide for more information. |
 | [App Support](https://support.bigcommerce.com/s/article/Apps-Video) | 🟡 | Back-office apps focused on backend and Control Panel functionality are supported in Catalyst. Additionally, any app that exposes APIs can be integrated with custom code.  However, storefront apps that modify frontend storefront behavior most likely will not work with Catalyst. To learn more about app compatibility with Catalyst, read our [Building Catalyst compatible apps guide](/docs/integrations/apps/guide/catalyst-compatible-apps). |
 | Masquerading / Login as Customer | 🟡 |Supported by [Catalyst Customer Login app](https://login.bigcommerce.com/deep-links/marketplace/apps/57141) but not natively supported |
@@ -54,5 +55,4 @@ Below is a list of major BigCommerce platform features, detailing what support e
 | [Abandoned Cart](https://support.bigcommerce.com/s/article/Using-the-Abandoned-Cart-Saver?language=en_US) | 🔴 | Specifically, the ability for Catalyst to take a customer-facing Abandoned Cart URL and apply it to the Catalyst cart is not supported. |
 | File Upload Product Option Type | 🔴 | |
 | Product Videos | 🔴 | Can be custom-built using the GraphQL Storefront API |
-| Express Wallet Buttons | 🔴 | Can be custom-built using the GraphQL Storefront API |
 | [Gift Wrapping](https://support.bigcommerce.com/s/article/Gift-Wrapping) | 🔴 | Can be built using the GraphQL Storefront API by querying gift wrapping options ([example here](/docs/storefront/graphql/examples/products#get-product-gift-wrapping-options)) and passing them to the [Get a cart](/docs/storefront/cart-checkout/guide/graphql-storefront#get-a-cart) query |