docs: enhance documentation clarity and examples in Nada-by-example

[CreeptoGengar]

This PR improves the documentation clarity in the Nada-by-example section by adding more detailed explanations and examples.

Changes made:

1. addition.md:

   • Added comprehensive description of basic addition operations
   • Clarified the fundamental arithmetic capabilities

2. arg-max.md:

   • Improved technical terminology (changed "Argmax" to "arg max")
   • Added concrete example with sequence [3, 1, 4, 1, 5]
   • Enhanced explanation of index-based results

3. cardio-risk.md:

   • Added detailed explanation of privacy-preserving features
   • Included risk score scale (0-100)
   • Added interpretation guidelines for risk levels
   • Specified examples of health metrics used

4. comparison.md:

   • Added general introduction to comparison operators
   • Clarified return values (boolean true/false)
   • Added specific descriptions for each operator (<, <=, >, >=)
   • Highlighted secure computation aspect

These changes make the documentation more accessible to new users while maintaining technical accuracy.

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Name	Status	Preview	Comments	Updated (UTC)
nillion-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 27, 2024 6:52pm