Update to average Grüneisen documentation

[JaGeo]

I have clarified the description of the average Grüneisen paramter.

[coderabbitai]

Walkthrough

The recent update enhances the documentation in the pymatgen library, particularly focusing on the average_gruneisen function in the phonon module. This improvement involves adding a specific reference source for definitions related to negative frequencies, aiming to enhance clarity and usefulness for users.

Changes

File Path	Change Summary
pymatgen/.../gruneisen.py	Updated documentation to include a reference for definitions related to negative frequencies in the average_gruneisen function.

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Recent Review Details

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Commits

Files that changed from the base of the PR and between 9662575 and 6f35223.

Files selected for processing (1)

• pymatgen/phonon/gruneisen.py (1 hunks)

Files skipped from review as they are similar to previous changes (1)

• pymatgen/phonon/gruneisen.py

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[JaGeo]

@janosh I have merged as it is a tiny change to the docu and the tests pass