docs(native-recipe): say where each setting reports a variant that one theme lacks

The page said that the config compiles and only a call that sets the
missing variant fails, which holds with exactOptionalPropertyTypes only.
With strict alone, as React Native apps compile, TypeScript reports the
error at the config. The page now names both.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: timphandev

docs/src/content/docs/native-recipe/create-themed-recipes.mdx

@@ -85,13 +85,14 @@ createStyleRecipe((theme) => ({
 }));
 
 // Wrong: the branch is around the variant, so one theme has no `outlined`.
+// TypeScript reports an error here. With exactOptionalPropertyTypes, it
+// reports one at each call that sets `outlined` instead.
 const box = createStyleRecipe((theme) => ({
   variants: theme.highContrast
     ? {}
     : { outlined: { true: { borderWidth: 1 } } },
 }));
 
-// @ts-expect-error: the config compiles, but no call can set `outlined`.
 box(light, { outlined: true });
 ```