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It seems the tutorial is out of date, as even the final returns errors, so I know it isn't with my implementation after going through the tutorial.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

Start in the final/server tutorial implementation and inspect the schema used by the GetLaunches query in the playground. Compare the query's requested fields with the LaunchConnection type and the tutorial text. Done means the documented query matches the final schema and runs without GraphQL validation errors.

Written by the indexing model from the issue text.