docs: fix CometLogger log_model docstring example

[gaurav0107]

What does this PR do?

Fixes the broken docstring example for log_model in the CometLogger
class (src/lightning/pytorch/loggers/comet.py). The current example is
syntactically invalid Python — it places a positional argument after a
keyword argument, and it omits the file_or_folder= keyword that the
Comet SDK requires.

Before:

logger.experiment.log_model(name="my-model", "<path to your model>")

After:

logger.experiment.log_model(name="my-model", file_or_folder="<path to your model>")

This matches the call signature documented at
https://www.comet.com/docs/v2/api-and-sdk/python-sdk/reference/Experiment/#experimentlog_model
and the worked example in issue #20583.

Fixes #20583

Before submitting

• Was this discussed/agreed via a GitHub issue? — yes, Comet: Undocumented and incorrectly described function #20583, with a worked example by the reporter.
• Did you read the contributor guideline?
• Did you make sure your PR does only one thing? — yes, single-line docstring fix; no behavior changes.
• N/A documentation update beyond the docstring itself.
• N/A new tests — docstring-only change, nothing to test.
• Did you verify new and existing tests pass locally with your changes? — ruff check and ruff format --check pass; AST parses cleanly.
• N/A breaking changes.
• N/A CHANGELOG — PR template explicitly excludes docstring fixes.

PR review

Anyone in the community is welcome to review the PR.

[gaurav0107]

Marked ready for review. This is a one-line docstring fix matching the corrected call signature in the issue body — no behavior change, ruff check and ruff format both pass locally. Happy to adjust if maintainers prefer a fuller rewrite of the surrounding log_model docs as a follow-up.

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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79%. Comparing base (4819088) to head (aedba1b).
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Flag	BASE (4819088)	HEAD (aedba1b)
python3.10	36	3
cpu	500	41
lightning	179	15
pytest	250	0
python	36	3
lightning_fabric	160	0
python3.12	144	11
python3.12.7	106	9
python3.11	72	6
python3.13	106	9
pytorch2.8	36	6
pytorch_lightning	161	26
pytest-full	250	41
pytorch2.7	18	3
pytorch2.9	36	5
pytorch2.10	36	6
pytorch2.6	17	3
pytorch2.4.1	17	3
pytorch2.2.2	18	3
pytorch2.1	36	6
pytorch2.3	18	3
pytorch2.5.1	18	3

Additional details and impacted files

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- Coverage      87%      79%     -8%     
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  Files         270      267      -3     
  Lines       24010    23951     -59     
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- Hits        20790    18830   -1960     
- Misses       3220     5121   +1901     

[gaurav0107]

Rebased onto the latest master and force-pushed; the one-line docstring change itself is unchanged. The earlier docs-make (pytorch, doctest) failure was a transient CI issue rather than anything in this diff — this PR only edits a non-executed .. code-block:: python example, and doctest is green on master. It now passes on the rebased commit (efa33efa6). The only remaining red check is the external Read the Docs build, which isn't a required merge gate.