Fix link in getting-started.mdx

[NimJay]

• This link doesn't seem to work: https://docs.confident-ai.com/docs/evaluation-introduction#using-a-custom-llm
• I assume the correct link is: https://docs.confident-ai.com/docs/guides-using-custom-llms

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Name	Status	Preview	Comments	Updated (UTC)
evals-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 4, 2024 5:12pm

[penguine-ip]

@NimJay yes ty so much!