docs: trim prompt custom URL action variant intro

Co-Authored-By: Devin Logan <devinannlogan@gmail.com>

Author: devin-ai-integration[bot]

fern/products/docs/pages/component-library/default-components/prompt.mdx

@@ -101,9 +101,7 @@ Generate a TypeScript SDK from my OpenAPI spec. Follow the [TypeScript SDK quick
 
 ### With a custom URL action
 
-Beyond the `cursor`, `claude`, and `chatgpt` shorthands, you can pass a custom action object to point at any AI tool. The `label` is rendered verbatim (no `Open in` prefix), and the `url` accepts an optional `{prompt}` placeholder that's replaced with the URL-encoded prompt body. If you omit `{prompt}`, the prompt is appended as a `prompt` query parameter. Custom URLs must use `http` or `https`. The optional `icon` accepts a [Font Awesome icon](/learn/docs/writing-content/components/icons) name or image URL and falls back to a sparkle icon when omitted.
-
-Custom and built-in actions can be mixed in the same `actions` array.
+Pass a `{ label, url, icon? }` object in `actions` to point at any AI tool. Custom and built-in actions can be mixed in the same array.
 
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