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.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79%. Comparing base (eea7443) to head (b20e94b).
⚠️ Report is 15 commits behind head on master.
✅ All tests successful. No failed tests found.
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HEAD has 894 uploads less than BASE

Flag	BASE (eea7443)	HEAD (b20e94b)
cpu	246	42
python	18	3
lightning_fabric	81	0
pytest	126	0
lightning	89	15
python3.11	36	6
python3.12	71	12
python3.10	17	3
python3.13	50	9
python3.12.7	54	9
pytorch2.3	9	3
pytest-full	120	42
pytorch2.8	15	6
pytorch_lightning	76	27
pytorch2.5.1	9	3
pytorch2.10	17	6
pytorch2.1	17	6
pytorch2.6	9	3
pytorch2.4.1	9	3
pytorch2.2.2	9	3
pytorch2.7	9	3
pytorch2.9	17	6

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #21759     +/-   ##
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- Coverage      87%      79%     -8%     
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  Files         270      267      -3     
  Lines       24064    24005     -59     
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- Hits        20874    18871   -2003     
- Misses       3190     5134   +1944     

[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.

[gaurav0107]

Rebased again onto the latest master (now at b20e94bfb) to re-trigger CI; the one-line docstring edit is unchanged.

The only substantive red was a single pl-cpu (ubuntu-22.04, pytorch, 3.12, 2.9) job failing at the Testing PyTorch step. This PR changes exactly one line inside a non-executed .. code-block:: python example in comet.py, so it cannot affect any pl-cpu test — every other pl-cpu matrix entry (macOS, Windows, and the other Linux versions) was green on the same run. It's unrelated master flakiness; the rebase should clear it. ruff check/ruff format --check pass locally and the corrected example now parses as valid Python (the original raised SyntaxError: positional argument follows keyword argument).