docs: Add cookbook recipe for custom occ endpoints

[mateuszo]

🔗 Linked issue

❓ Type of change

• [x] 📖 Documentation (updates to the documentation, readme or JSDoc annotations)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This will help devs handle a common case of handling custom SAP OCC endpoints. I also need it for my workshops that will take place on 24th of April.

📝 Checklist

• [ ] I have linked an issue or discussion.
• [x] I have updated the documentation accordingly.

[changeset-bot[bot]]

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Latest commit: c8a0019bad277e7b6b3eabb8d0c31a7ed6ea209c

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