docs: fix URL link to valibot

(cherry picked from commit 402ecaf)

Author: Adam95

adev/src/content/guide/forms/signals/validation.md

@@ -660,7 +660,7 @@ The `valid()` signal returns `false` while validation is pending, even if there
 
 ## Integration with schema validation libraries
 
-Signal Forms have built-in support for libraries that conform to [Standard Schema](https://standardschema.dev/) like [Zod](https://zod.dev/) or [Valibot](https://www.validbot.com/). The integration is provided via the `validateStandardSchema` function. This allows you to use existing schemas while maintaining Signal Forms' reactive validation benefits.
+Signal Forms have built-in support for libraries that conform to [Standard Schema](https://standardschema.dev/) like [Zod](https://zod.dev/) or [Valibot](https://valibot.dev/). The integration is provided via the `validateStandardSchema` function. This allows you to use existing schemas while maintaining Signal Forms' reactive validation benefits.
 
 ```ts
 import {form, validateStandardSchema} from '@angular/forms/signals';