Update index.md with API key edit

[elenananana]

Description

Describe the changes that were made in this pull request. When possible start with the motivations behind the change. Be sure to also include the following information:

1. Motivation for change?
2. What was changed?
3. Link to relevant issues?

Checklist

• [ ] Conventional commits were used
• [ ] New links to files and images were verified
• [ ] For fixes/refactors: all existing references were identified and replaced
• [ ] Style guide was reviewed and applied
• [ ] Clear code samples were provided
• [ ] People were tagged for review

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Name	Status	Preview	Comments	Updated (UTC)
hiro-systems-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 29, 2024 3:33pm