docs: #377 update mdbook nodes info

[miguelcsx]

Description

This PR updates the mdbook to provide more detailed and accurate information about nodes.

Changes:

• Revised the nodes information to ensure accuracy and completeness.
• Clarified the usage of the cli and detailed the flags related to the Abstract Syntax Tree (AST).

Motivation and Context

The previous documentation on nodes was incomplete and lacked specific details about cli usage and AST flags. These updates aim to improve the comprehensibility and usability of the documentation for users working with nodes and ASTs.

[miguelcsx]

@marco-c I made the suggested changes, I hope they meet your specifications. :+1: