Update conversation insights documentation

[mintlify]

Updated the conversation insights section to reflect that the feature is now automatically enabled for all Custom plan users. This change aligns the documentation with PR #5312, which removed the UI toggle for enabling/disabling conversation insights.

Files changed

• ai/suggestions.mdx - Updated "Conversation insights" section to indicate automatic enablement

Generated from feat: remove assistant suggestions toggle @rtbarnes

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Note

Aligns documentation with current behavior of conversation insights.

• Updates the "Conversation insights" section in ai/suggestions.mdx to indicate the feature is automatically enabled for Custom plan users
• Removes prior guidance about manually enabling the feature and clarifies ongoing analysis of assistant conversations

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