[Tutorial]: Fix Typescript code blocks inconsistency (#6801)

* fix doc inconsistency
* update type for createContact exemple

docs/docs/tutorial/chapter3/saving-data.md

@@ -298,9 +298,10 @@ export const deleteContact = ({ id }) => {
 <TabItem value="ts" label="TypeScript">
 
 ```js title="api/src/services/contacts/contacts.ts"
-import { db } from 'src/lib/db'
 import type { QueryResolvers, MutationResolvers } from 'types/graphql'
 
+import { db } from 'src/lib/db'
+
 export const contacts: QueryResolvers['contacts'] = () => {
   return db.contact.findMany()
 }
@@ -1280,14 +1281,14 @@ export const createContact = ({ input }) => {
 <TabItem value="ts" label="TypeScript">
 
 ```ts title="api/src/services/contacts/contacts.ts"
-import type { Prisma } from '@prisma/client'
+import type { QueryResolvers, MutationResolvers } from 'types/graphql'
 
 // highlight-next-line
 import { validate } from '@redwoodjs/api'
 
 // ...
 
-export const createContact = ({ input }: CreateContactArgs) => {
+export const createContact = ({ input }: MutationResolvers['createContact']) => {
   // highlight-next-line
   validate(input.email, 'email', { email: true })
   return db.contact.create({ data: input })