Update index.md

[Kirbyrawr]

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [X] I have read the CONTRIBUTING document.
• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have added tests to cover my changes.
• [X] All new and existing tests passed.

[Kirbyrawr]

Hi @leighmcculloch i also updated the index of the docs to follow the XDR Generation part you improved. Thanks.