I am missing the following information:

* [x]  The usage section should include the new argument `-de | --default_extensibility`.

* [x]  A note clarifying in [Zero copy constraints](https://fast-dds.docs.eprosima.com/en/latest/fastdds/use_cases/zero_copy/zero_copy.html#constraints) stating that only FINAL types are considered to be plain (an a reference to the extensibility section).

* [x]  New header files and constants should be included into the API reference:
  
  * eprosima::fastcdr::CdrVersion DEFAULT_XCDR_VERSION
  * DataRepresentationId_t DEFAULT_DATA_REPRESENTATION

* [x]  Fast DDS Docs manual CI should be updated to use CMake 3.22. Probably the nightly job should also be updated.

* [x]  Example CMakeList should use CMake minimum version 3.22.

* [x]  The [getting started application section](https://fast-dds.docs.eprosima.com/en/latest/fastdds/getting_started/simple_app/simple_app.html#build-the-topic-data-type) explains the files generated by Fast DDS-Gen. It should be updated with the two new generated files.

* [x]  The previous point also applies to the [Python application](https://fast-dds.docs.eprosima.com/en/latest/fastdds/getting_started/simple_python_app/simple_python_app.html#build-the-topic-data-type)

Done in 100644

The CI results can be found in this job

The following warnings are being displayed:

/home/runner/work/Fast-DDS/Fast-DDS/src/fastdds-docs/docs/../../src/fastdds-docs/docs/fastdds/getting_started/simple_app/includes/publisher.rst.rst:163: WARNING: line number spec is out of range(1-47): '47-48'
/home/runner/work/Fast-DDS/Fast-DDS/src/fastdds-docs/docs/../../src/fastdds-docs/docs/fastdds/getting_started/simple_app/includes/subscriber.rst.rst:118: WARNING: line number spec is out of range(1-47): '50-51'
../../src/fastdds-docs/docs/fastdds/getting_started/simple_app/includes/subscriber.rst:118: WARNING: Line spec '50-51': no lines pulled from include file '/home/runner/work/Fast-DDS/Fast-DDS/src/fastdds-docs/code/Examples/C++/DDSHelloWorld/CMakeLists.txt'

Also the doc8 tests complains about:

/home/runner/work/Fast-DDS/Fast-DDS/src/fastdds-docs/docs/fastdds/use_cases/zero_copy/zero_copy.rst:156: D001 Line too long

Finally, the spell check is also failing (though I think that it can be the same error as the doc8)