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
Documentation-only changes clarifying where GitHub/GitLab repo access is configured; no product logic or APIs are modified.

Overview
Clarifies in the Slack agent docs that GitHub/GitLab repository access is not configured via Composio and must be set up through the dashboard-installed Mintlify GitHub App or GitLab integration, including links to the relevant deploy pages.

Updates the Slack integration request examples to remove GitHub and use Linear instead, applied consistently across English, Spanish, French, and Chinese pages.

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[mintlify]

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