fixed "reducer" param typo. (#1408)

Author: AbdouTanta

docs/tutorials/quick-start.mdx

@@ -148,7 +148,7 @@ export default counterSlice.reducer
 
 ### Add Slice Reducers to the Store
 
-Next, we need to import the reducer function from the counter slice and add it to our store. By defining a field inside the `reducers` parameter, we tell the store to use this slice reducer function to handle all updates to that state.
+Next, we need to import the reducer function from the counter slice and add it to our store. By defining a field inside the `reducer` parameter, we tell the store to use this slice reducer function to handle all updates to that state.
 
 ```ts title="app/store.js"
 // file: features/counter/counterSlice.ts noEmit