adds note about prebuilt integrations to auto import page

[benironside]

Adds a note to clarify the relationship between auto import-generated integrations and custom built, user-uploaded integrations. Follow-up in the integrations repo is tracked here.

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• [ x] Yes — Claude 4.7/Cursor
• No

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🔍 Preview links for changed docs

• explore-analyze/ai-features/automatic-import.md

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Elastic Docs Style Checker (Vale)

Summary: 3 suggestions found

💡 Suggestions (3): Optional style improvements. Apply when helpful.

File	Line	Rule	Message
explore-analyze/ai-features/automatic-import.md	109	Elastic.FirstPerson	Use caution when using first-person pronouns such as 'my.'
explore-analyze/ai-features/automatic-import.md	112	Elastic.FirstPerson	Use caution when using first-person pronouns such as 'my.'
explore-analyze/ai-features/automatic-import.md	112	Elastic.FirstPerson	Use caution when using first-person pronouns such as 'my.'

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