[Fundamentals] Update index.mdx

[nenizera]

Summary

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Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated the definition of a domain name to include the term 'zone' for clarity.

• Clarified the definition of a domain name by adding 'also known as a zone' to the text.

Modified Files

• src/content/docs/fundamentals/manage-domains/index.mdx

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