[Concept Entry] PyTorch: Built-in Loss Functions

[codecademy-docs]

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We would like a new entry on Built-in Loss Functions concept under PyTorch. The entry should go in a new file under docs/content/pytorch/concepts/built-in-loss-functions/built-in-loss-functions.md.

The entry should include:

• An introduction to the concept
• A Syntax section that provides the syntax for the concept (if applicable)
• An Example section that provides an example demonstrating the concept in use (if applicable)

Please refer to the concept entry template, content standards, and markdown style guide when working on the PR for this issue.|

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New Concept Entry for Existing Topic

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