fix: Fix code formatting in 2N intercom guide

[louis-pre]

Summary

• Fixed broken Python code block in section 3 (escaped backticks and code on same line as fence, split into two code blocks)
• Fixed Ruby output collapsed onto a single line
• Unescaped all GitBook tags (\{% ... %\} → {% ... %}) that were breaking tab rendering
• Fixed openapi tag formatting (unescaped, split onto separate lines)

Test plan

• Verify code blocks render correctly on /device-and-system-integration-guides/2n-intercom-systems/get-started-with-2n-intercoms#id-3-retrieve-my2n-devices
• Verify tabs work in sections 3 and 4

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