fix(laravel sanctum): grammar mistake (#824)

Author: stickpro

src/providers/laravel/sanctum.ts

@@ -4,7 +4,7 @@ export default function laravelSanctum (_nuxt, strategy) {
   const { url } = strategy
 
   if (!url) {
-    throw new Error('url is required is laravel sanctum!')
+    throw new Error('URL is required with Laravel Sanctum!')
   }
 
   const endpointDefaults = {