[Docs] Incomplete TODO placeholder in 'Develop Miden in Rust' guide (v0.12)

[giwaov]

Summary

The "Develop Miden in Rust" compiler guide (versioned_docs/version-0.12/compiler/guides/develop_miden_in_rust.md) contains an unresolved TODO placeholder in published documentation.

Problem

The guide states:

TODO: Add examples of using operations on Felt type and available functions (assert*, etc.)

This is a development placeholder that was published as-is. The guide covers Felt initialization (felt! macro and Felt::new) but stops short of documenting:

• Arithmetic operations on Felt (+, -, *, / and their wrapping/modulo behavior)
• Available assertion functions (assert*)
• Practical usage patterns combining these operations
• Error handling for values outside the valid field range (0 to 2^64 - 2^32 + 1)

Impact

Developers following this guide to build Miden programs in Rust reach a gap at the point where they need to actually use Felt values in operations. The guide sets up the type but doesn't show how to work with it.

Suggested Fix

Either:

1. Complete the section with examples of Felt arithmetic, assertions, and common patterns
2. Or link to the miden-stdlib-sys crate documentation / README where these operations may already be documented

[Sachinhm22]

Hi,
I’d like to work on this issue and submit a PR. Please let me know if that’s okay.