Napoleon extension has unused code for a "Usage" section

[cmarqu]

Describe the bug

The section name "Usage" does not appear in https://www.sphinx-doc.org/en/master/usage/extensions/napoleon.html#docstring-sections
but apparently there is unused code for it:

sphinx/sphinx/ext/napoleon/docstring.py

Lines 556 to 558 in fc62472

	def _consume_usage_section(self) -> list[str]:
	lines = self._dedent(self._consume_to_next_section())
	return lines

sphinx/sphinx/ext/napoleon/docstring.py

Lines 913 to 918 in fc62472

	def _parse_usage_section(self, section: str) -> list[str]:
	header = ['.. rubric:: Usage:', '']
	block = ['.. code-block:: python', '']
	lines = self._consume_usage_section()
	lines = self._indent(lines, 3)
	return header + block + lines + ['']

All the other _parse_*_section methods are called in the code starting at

sphinx/sphinx/ext/napoleon/docstring.py

Line 371 in fc62472

self._sections: dict[str, Callable[..., list[str]]] = {

How to Reproduce

Browsing and grepping code.

Environment Information

This is in current Sphinx 8.1.3.

Sphinx extensions

napoleon

Additional context

No response