PR #18043: Update indentation level - losses.py

Imported from GitHub PR #18043

This PR changes the indentation level of the docstrings to 4 spaces.
Copybara import of the project:

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258e866 by Kaan Bıçakcı <[email protected]>:

Update docstring indendation to 4 spaces.

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7c4ca54 by Kaan Bıçakcı <[email protected]>:

Move CosineSimilarity class to up top.

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643b1ae by Kaan Bıçakcı <[email protected]>:

Fix formatting

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8addc40 by Kaan Bıçakcı <[email protected]>:

Add Defaults to `False` for use_legacy_format param.

Merging this change closes #18043

FUTURE_COPYBARA_INTEGRATE_REVIEW=#18043 from Frightera:migrate_losses_docstring b305e0a
PiperOrigin-RevId: 527630600