Add Comprehensive Rustdoc Comments to All Modules

[devin-ai-integration]

Add Comprehensive Rustdoc Comments to All Modules

This PR adds comprehensive rustdoc comments to all modules in the Neo N3 SDK, following Rust documentation best practices. The documentation includes detailed explanations, practical code examples, and cross-references between related modules.

Changes

• Added module-level documentation to all core modules:

  • neo_builder
  • neo_clients
  • neo_contract
  • neo_crypto
  • neo_protocol
  • neo_types
  • neo_wallets
  • neo_x
  • neo_sgx

• Fixed broken intra-doc links to ensure documentation compiles without errors

• Ensured all documentation follows consistent style with existing documentation

Documentation Features

• Detailed explanations of each module's purpose and functionality
• Overview sections describing module features and capabilities
• Practical code examples demonstrating module usage
• Cross-references between related modules where appropriate

These documentation improvements will make it easier for developers to understand and use the Neo N3 SDK for building applications on the Neo blockchain.

Link to Devin run: https://app.devin.ai/sessions/bc2a0d70f17f44518478567e1d0f8730
Requested by: Jimmy

[devin-ai-integration]

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