Trim LaTeX comment, obsolete as of latest TeXLive fontawesome6 and 7

[jfbu]

Turns out that the comment was related with this closed issue:

braniii/fontawesome#19

The CTAN and TeXLive attow (2025/09/21) got the bugfix.

(as testing with DocUtils HEAD currently fails #13886, the LaTeX CI will fail too)

[jfbu]

Actually CI fails massively as it uses uv pip install --upgrade "docutils~=0.22.0" and in this comment @gmilde warned testing would fail with Docutils 0.22.1. And PyPi Docutils is at 0.22.2 as of 2025-09-20.

FAILED tests/test_util/test_util_docutils_sphinx_directive.py::test_sphinx_directive_parse_content_to_nodes - AttributeError: 'NoneType' object has no attribute 'section_hierarchy'
FAILED tests/test_util/test_util_docutils_sphinx_directive.py::test_sphinx_directive_parse_text_to_nodes - AttributeError: 'NoneType' object has no attribute 'section_hierarchy'