ENOENT: no such file or directory, open './schema.graphql'
### Issue Description

Going over docs I stuck on https://www.apollographql.com/docs/apollo-server/workflow/generate-types
The documentation says:
"move your server's schema into a .graphql file" and then use it like so:

```
// ...other imports
import { readFileSync } from 'fs';

// Note: this uses a path relative to the project's
// root directory, which is the current working directory
// if the server is executed using `npm run`.
const typeDefs = readFileSync('./schema.graphql', { encoding: 'utf-8' });
```

Error:
```
node:fs:592
  handleErrorFromBinding(ctx);
  ^

Error: ENOENT: no such file or directory, open './schema.graphql'
    at Object.openSync (node:fs:592:3)
    at readFileSync (node:fs:460:35)
    at file:///Users/<location>/index.js:6:18
    at ModuleJob.run (node:internal/modules/esm/module_job:192:25) {
  errno: -2,
  syscall: 'open',
  code: 'ENOENT',
  path: './schema.graphql'
}

```

### Link to Reproduction

https://github.com/egor-sorokin/graphql-try

### Reproduction Steps

- install dependecies
- run `npm run start`