Update documentation with example for custom serialization

[chrismostert]

📒 Description

Adds a small snippet to the documentation on how to register a custom serialization function for a specific data type. This approach can be used to resolve issues like #917

🔗 What I've Done

Since no changes in the code were required, the documentation has been updated with a small code snippet.

💬 Comments

Please check if the snippet is informative enough.

🛫 Checklist

• Updated docs
• Added unit-tests (not needed)
• Sample tests pass
• W3C tests pass

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud