chore: update custom-analyzers.md

[ianchen0119]

Closes #

📑 Description

Update the page: https://docs.k8sgpt.ai/tutorials/custom-analyzers/

✅ Checks

• [x] My pull request adheres to the code style of this project
• [x] My code requires changes to the documentation
• [x] I have updated the documentation as required
• [x] All the tests have passed

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[ianchen0119]

Hi @AlexsJones,

Sorry for disturbing you. Could you please help to review this PR? Many thanks.