querying `launches` returns errors on "final" repo.

It seems the tutorial is out of date, as even the final returns errors, so I know it isn't with my implementation after going through the tutorial.

The playground returns the following after running the `GetLaunches` query from the tutorial:

```
{
"error": {
"errors": [
{
"message": "Cannot query field \"id\" on type \"LaunchConnection\".",
"locations": [
{
"line": 3,
"column": 5
}
],
"extensions": {
"code": "GRAPHQL_VALIDATION_FAILED",
"exception": {
"stacktrace": [
"GraphQLError: Cannot query field \"id\" on type \"LaunchConnection\".",
" at Object.Field (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/validation/rules/FieldsOnCorrectType.js:64:31)",
" at Object.enter (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/language/visitor.js:333:29)",
" at Object.enter (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/language/visitor.js:384:25)",
" at visit (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/language/visitor.js:251:26)",
" at Object.validate (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/validation/validate.js:63:22)",
" at validate (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/apollo-server-core/dist/requestPipeline.js:172:32)",
" at Object. (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/apollo-server-core/dist/requestPipeline.js:113:38)",
" at Generator.next ()",
" at fulfilled (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/apollo-server-core/dist/requestPipeline.js:4:58)",
" at process._tickCallback (internal/process/next_tick.js:68:7)"
]
}
}
},
{
"message": "Cannot query field \"mission\" on type \"LaunchConnection\".",
"locations": [
{
"line": 4,
"column": 5
}
],
"extensions": {
"code": "GRAPHQL_VALIDATION_FAILED",
"exception": {
"stacktrace": [
"GraphQLError: Cannot query field \"mission\" on type \"LaunchConnection\".",
" at Object.Field (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/validation/rules/FieldsOnCorrectType.js:64:31)",
" at Object.enter (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/language/visitor.js:333:29)",
" at Object.enter (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/language/visitor.js:384:25)",
" at visit (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/language/visitor.js:251:26)",
" at Object.validate (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/graphql/validation/validate.js:63:22)",
" at validate (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/apollo-server-core/dist/requestPipeline.js:172:32)",
" at Object. (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/apollo-server-core/dist/requestPipeline.js:113:38)",
" at Generator.next ()",
" at fulfilled (/home/petty/Github/apollo-graphql/fullstack-tutorial/final/server/node_modules/apollo-server-core/dist/requestPipeline.js:4:58)",
" at process._tickCallback (internal/process/next_tick.js:68:7)"
]
}
}
}
]
}
}
```

Bắt đầu trong phần triển khai tutorial của final/server và kiểm tra schema được truy vấn GetLaunches sử dụng trong playground. So sánh các trường mà truy vấn yêu cầu với kiểu LaunchConnection và nội dung tutorial. Công việc được hoàn thành khi truy vấn được ghi trong tài liệu khớp với schema cuối cùng và chạy mà không có lỗi xác thực GraphQL.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.