Add note to CTAForm docs with validation recommendation (#1038)

* add note to CTAForm docs to with validation recommendation

* rephrasing

* fix broken docs link

Author: joshfarrant

apps/docs/content/components/CTAForm/react.mdx

@@ -24,6 +24,10 @@ import {CTAForm} from '@primer/react-brand'
 
 ## Examples
 
+For simplicity, examples on this page use default browser validation.
+
+Use [`FormControl` validation](/components/FormControl/#validation) to display the correct status in accordance with [Primer form guidelines](https://primer.style/product/ui-patterns/forms/#validation).
+
 ### Default
 
 ```jsx live

apps/next-docs/content/components/CTAForm/react.mdx

@@ -16,6 +16,10 @@ import {CTAForm} from '@primer/react-brand'
 
 ## Examples
 
+For simplicity, examples on this page use default browser validation.
+
+Use [`FormControl` validation](/forms/FormControl/#validation) to display the correct status in accordance with [Primer form guidelines](https://primer.style/product/ui-patterns/forms/#validation).
+
 ### Default
 
 ```jsx live