[Chapter 04 - MicroProfile OpenAPI 4.1] Updating the content with the latest features from MP OpenAPI 4.1 (#63)

* Update chapter04.adoc

* Refine MicroProfile OpenAPI documentation for clarity

Improved clarity and readability of the MicroProfile OpenAPI section by rephrasing sentences and enhancing consistency in terminology.

* Revise chapter04.adoc for clarity and corrections

Updated the chapter content to improve clarity and correctness, including rephrasing sentences and fixing typographical errors.

* Enhance clarity and readability of OpenAPI section

Rephrase and clarify the explanation of the OpenAPI Specification and its benefits, improving readability and consistency.

* Refactor OpenAPI documentation and update dependency version

Reorganize content on generating OpenAPI documents and improve clarity on annotation-based generation. Update version number for microprofile-openapi-api dependency.

* Update chapter04.adoc to reflect annotation scanning changes

Removed the section on configuring annotation scanning and added a note about its default state.

* Simplify API response annotations in chapter04.adoc

Refactored API response annotations for clarity and updated a note about usage of @APIResponses with `extensions' meta data fields.

* Enhance filter use cases and add tool integration details

Updated practical use cases for filters with more detailed examples and added notes on tool integration.

* Remove MicroProfile OpenAPI 4.1 features section

Removed section on new features in MicroProfile OpenAPI 4.1 and updated related content for clarity.

* Change version from 4.1 to 4.0 and add clarifications

Updated the version number from 4.1 to 4.0 and added a note about the new features and clarifications in MicroProfile OpenAPI 4.0.

* Refactor ExtensionFilter to use simplified operation methods

Simplified the example by using the `getExtension()` method added in 4.1, along with the preexisting `addExtension()` method, rather than handling the map of extensions directly.

* Update chapter04.adoc

* Improve clarity in chapter 04 documentation

Refine chapter summary and core concepts for clarity and conciseness.

* Update chapter04.adoc for MicroProfile OpenAPI 4.1

* Improving tutorial chapter content

- Simplified Tutorial content
- Removed advanced features that are rarely used.

* Refactor security scheme annotation for Product API

Updated the chapter to remove the unnecessary `@SecuritySchemes` wrapper annotation, as @Securityscheme is repeatable and can be used directly. 

The example now shows the simplified syntax.

* Update chapter04.adoc

Removed both the "Support for Java records" section and the corresponding bullet from the summary.

Author: ttelang