[21144] Fix Doxygen errors for Doxygen versions prior to 1.8.19

[EduPonz]

Description

This PR fixes some Doxygen errors when generating the API reference with Doxygen versions prior to 1.8.19, as it is the case of Fast DDS docs RTD page, which is generated in Ubuntu 20.04 and therefore with Doxygen 1.8.17.
Although Doxygen documentation documents the dir attribute of the param directive to be one of [in], [out], and [in,out], doxygen/doxygen#7881 introduced, among other things, the possibility to set the dir attribute to [in out], which #4746 introduced in several places.

Mind that in the dev machines this "mistake" went undetected because of the use of Ubuntu 22.04 (Doxygen 1.9.1).
Also, even though an error when generating the Doxygen documentation makes Fast DDS docs build to fail when building it through CMake, the RTD generation is done within conf.py directly, and the return code of the subprocess is not checked, which makes the RTD documentation to finish the build but then show an error on the API reference as follows.

This has been addressed in:

• [21114] Check suprocess return codes on RDT generation Fast-DDS-docs#795

The doxygen documentation is updated in:

• Document all possible values of the dir attribute within the param command doxygen/doxygen#10927

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• N/A: Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• N/A: Any new/modified methods have been properly documented using Doxygen.
• N/A: Any new configuration API has an equivalent XML API (with the corresponding XSD extension)
• N/A: Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• N/A: Changes are API compatible.
• N/A: New feature has been added to the versions.md file (if applicable).
• N/A: New feature has been documented/Current behavior is correctly described in the documentation.
• N/A: Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.