fix: Remove reference to using default with enum (#8311)

Author: stocaaro

src/pages/[platform]/build-a-backend/data/data-modeling/add-fields/index.mdx

@@ -224,7 +224,7 @@ const schema = a.schema({
 
 ## Assign default values for fields
 
-You can use the `.default(...)` modifier to specify a default value for optional [scalar type fields and enums](https://docs.aws.amazon.com/appsync/latest/devguide/scalars.html). The `.default(...)` modifier is not available for custom types, arrays, or relationships.
+You can use the `.default(...)` modifier to specify a default value for optional [scalar type fields](https://docs.aws.amazon.com/appsync/latest/devguide/scalars.html). The `.default(...)` modifier is not available for custom types, arrays, or relationships.
 
 ```ts
 const schema = a.schema({