Method Naming Conflict in GitHub API Example

## Description

The "References" page in the GitHub example throws this error:

```
Uncaught Error: Invariant Violation: flattenChildren(...): Encountered two children with the same key, `.1:$ref`. Children keys must be unique.
```

It's because there are 2 parameters in the same method (`Update a Reference`) which are both named `ref`.

## Details
- Steps to Reproduce: 
    1. Load the "References" page.