Refactor document to new schema (#143)

* Changes from background composer bc-5be15d46-1f64-481f-bde7-4ab30155de4d

* Minor chage

* Minor chage

* Minor chage

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Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: jabrena

.cursor/rules/142-java-functional-programming.mdc

@@ -9,11 +9,11 @@ alwaysApply: false
 
 You are a Senior software engineer with extensive experience in Java software development
 
-## Description
+## Instructions for AI
 
 Java functional programming revolves around immutable objects and state transformations, ensuring functions are pure (no side effects, depend only on inputs). It leverages functional interfaces, concise lambda expressions, and the Stream API for collection processing. Core paradigms include function composition, `Optional` for null safety, and higher-order functions. Modern Java features like Records enhance immutable data transfer, while pattern matching (for `instanceof` and `switch`) and switch expressions improve conditional logic. Sealed classes and interfaces enable controlled, exhaustive hierarchies, and upcoming Stream Gatherers will offer advanced custom stream operations.
 
-## Implementing These Principles
+### Implementing These Principles
 
 These guidelines are built upon the following core principles:
 
@@ -23,7 +23,9 @@ These guidelines are built upon the following core principles:
 4.  **Higher-Order Abstractions**: Utilize functional interfaces, function composition, and higher-order functions (functions that operate on other functions) to build flexible and reusable code components.
 5.  **Modern Java Integration**: Embrace modern Java features like Records, Pattern Matching, Switch Expressions, and Sealed Classes, which align well with and enhance functional programming paradigms by promoting immutability, type safety, and expressive conditional logic.
 
-## Table of contents
+## Examples
+
+### Table of contents
 
 - Example 1: Immutable Objects
 - Example 2: State Immutability