Fixed small typo on Flask sample README.md

[commit111]

changed "to o app" to "to do app"

Samples Checklist

• [ ] ./samples/angular-express/compose.yaml contains errors
  • [ ] ./samples/bullmq-bullboard-redis/compose.yaml contains errors
  • [ ] ./samples/csharp-dotnet/compose.yaml contains errors
  • [ ] ./samples/django-postgres/compose.yaml contains errors
  • [ ] ./samples/django/compose.yaml contains errors
  • [ ] ./samples/elysia/compose.yaml contains errors
  • [ ] ./samples/fastapi-postgres/compose.yaml contains errors
  • [ ] ./samples/fastapi/compose.yaml contains errors
  • [ ] ./samples/feathersjs/compose.yaml contains errors
  • [ ] ./samples/flask/compose.yaml contains errors
  • [ ] ./samples/golang-http-form/compose.yaml contains errors
  • [ ] ./samples/golang-http/compose.yaml contains errors
  • [ ] ./samples/golang-mongodb-atlas/compose.yaml contains errors
  • [ ] ./samples/golang-openai/compose.yaml contains errors
  • [ ] ./samples/golang-rest-api/compose.yaml contains errors
  • [ ] ./samples/golang-s3/compose.yaml contains errors
  • [ ] ./samples/golang-slackbot/compose.yaml contains errors
  • [ ] ./samples/hasura/compose.yaml contains errors
  • [ ] ./samples/huginn/compose.yaml contains errors
  • [ ] ./samples/imgproxy/compose.yaml contains errors
  • [ ] ./samples/javalin/compose.yaml contains errors
  • [ ] ./samples/langchain/compose.yaml contains errors
  • [ ] ./samples/metabase/compose.yaml contains errors
  • [ ] ./samples/nextjs-blog/compose.yaml contains errors
  • [ ] ./samples/nextjs-boilerplate/compose.yaml contains errors
  • [ ] ./samples/nextjs-documentation/compose.yaml contains errors
  • [ ] ./samples/nextjs-github-actions/compose.yaml contains errors
  • [ ] ./samples/nextjs/compose.yaml contains errors
  • [ ] ./samples/nocodb/compose.yaml contains errors
  • [ ] ./samples/nodejs-chatroom/compose.yaml contains errors
  • [ ] ./samples/nodejs-express/compose.yaml contains errors
  • [ ] ./samples/nodejs-form/compose.yaml contains errors
  • [ ] ./samples/nodejs-http/compose.yaml contains errors
  • [ ] ./samples/nodejs-openai/compose.yaml contains errors
  • [ ] ./samples/nodejs-react-postgres/compose.yaml contains errors
  • [ ] ./samples/nodejs-rest-api/compose.yaml contains errors
  • [ ] ./samples/nodejs-s3/compose.yaml contains errors
  • [ ] ./samples/phoenix-postgres/compose.yaml contains errors
  • [ ] ./samples/python-form/compose.yaml contains errors
  • [ ] ./samples/python-implicit-gpu/compose.yaml contains errors
  • [ ] ./samples/python-minimal/compose.yaml contains errors
  • [ ] ./samples/python-openai/compose.yaml contains errors
  • [ ] ./samples/python-rest-api/compose.yaml contains errors
  • [ ] ./samples/python-s3/compose.yaml contains errors
  • [ ] ./samples/rails/compose.yaml contains errors
  • [ ] ./samples/sailsjs-postgres/compose.yaml contains errors
  • [ ] ./samples/sailsjs/compose.yaml contains errors
  • [ ] ./samples/svelte-mysql/compose.yaml contains errors
  • [ ] ./samples/sveltekit-mongodb/compose.yaml contains errors
  • [ ] ./samples/sveltekit/compose.yaml contains errors
  • [ ] ./samples/vllm/compose.yaml contains errors