[Term Entry] PyTorch Tensor Operations: .neg()

[GooglyBlox]

Description

This PR adds a new term entry for the .neg() method in PyTorch's tensor operations.
This entry provides documentation on how to negate tensor elements, including syntax, parameters, return values, and practical examples demonstrating all three equivalent forms of negation in PyTorch.

The new file is located at: docs/content/pytorch/concepts/tensor-operations/terms/neg/neg.md

Issue Solved

Closes #7847

Type of Change

• Adding a new entry

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[GooglyBlox]

Hi, happy to be able to contribute! If you'd like any revisions, I'd be more than happy to make them.

[mamtawardhani]

Looks good for a second review! 🚀

[dakshdeepHERE]

Entry looks good for merge 🚀

[github-actions]

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