Configuration suppress_warnings -> 'ref.term' is ignored

[astromatt]

Describe the bug

Despite adding 'ref.term' to suppress_warnings in my conf.py sphinx build still throws:

WARNING: duplicate term description of ..., other instance in ...

I have narrowed down this to:

sphinx/sphinx/domains/std/__init__.py

Line 663 in b458850

dangling_warnings = {

How to Reproduce

1. Add 'ref.term' to suppress_warnings in your conf.py
2. Create two ReST documents: a.rst and b.rst
3. Add glossary with the same term in both
4. Run build
5. Warning is still visible

Environment Information

Platform:              darwin; (macOS-15.1.1-arm64-arm-64bit-Mach-O)
Python version:        3.13.0 (main, Oct  7 2024, 05:02:14) [Clang 16.0.0 (clang-1600.0.26.3)])
Python implementation: CPython
Sphinx version:        8.1.3
Docutils version:      0.21.2
Jinja2 version:        3.1.4
Pygments version:      2.18.0

Sphinx                        8.1.3
sphinx-rtd-theme              3.0.2
sphinxcontrib-applehelp       2.0.0
sphinxcontrib-devhelp         2.0.0
sphinxcontrib-htmlhelp        2.1.0
sphinxcontrib-jquery          4.1
sphinxcontrib-jsmath          1.0.1
sphinxcontrib-qthelp          2.0.0
sphinxcontrib-serializinghtml 2.0.0

### Sphinx extensions

Doesn't matter

### Additional context

_No response_