[20976] Remove reference to removed constant

[MiguelCompany]

Description

Remove reference to s_minimumSocketBuffer, since it is being removed by eProsima/Fast-DDS#4760

Contributor Checklist

• [NO] Commit messages follow the project guidelines.
  • I edited directly in github, and forgot to reference the redmine task. I put it in the PR title, though.
• N/A Code snippets related to the added documentation have been provided.
• Documentation tests pass locally.
• 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.
• CI passes without warnings or errors.

[EduPonz]

@richiprosima please test_3 this