Clarify GitHub and GitLab setup in Slack agent docs

[mintlify]

Summary

Updates the Slack agent documentation to reflect that GitHub and GitLab are no longer connectable through the agent's third-party integration flow. Repository access is configured via the Mintlify GitHub App or GitLab integration installed from the dashboard, not through Composio.

Changes

• Removed "Set up the GitHub integration" example from the list of integrations to request via Slack.
• Added a note linking to the GitHub App and GitLab integration deployment docs so users know where to configure repository access.
• Replaced the GitHub example with a Linear example to keep the list of three.
• Applied the same updates to the English, French, Spanish, and Chinese versions of the page.

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Note

Low Risk
Low risk documentation-only update that clarifies integration setup and examples; no product logic changes.

Overview
Clarifies in the Slack agent docs that GitHub and GitLab repository access is configured via Mintlify (the GitHub app / GitLab integration) rather than through Composio’s Slack-driven third‑party integration flow.

Updates the integration request examples by removing the GitHub example and replacing it with Linear, and applies the same clarification across the English, Spanish, French, and Chinese pages.

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[mintlify]

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