docs: move preferences from parameter to state (#1137)

Author: hafdon

packages/docs/core-concepts/actions.md

@@ -76,10 +76,11 @@ import { useAuthStore } from './auth-store'
 
 export const useSettingsStore = defineStore('settings', {
   state: () => ({
+    preferences: null,
     // ...
   }),
   actions: {
-    async fetchUserPreferences(preferences) {
+    async fetchUserPreferences() {
       const auth = useAuthStore()
       if (auth.isAuthenticated) {
         this.preferences = await fetchPreferences()