making litmodels message clearer

[craigpfeifer]

What does this PR do?

Modified the message to specify the package to install and benefit of use

Fixes #<issue_number>

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📚 Documentation preview 📚: https://pytorch-lightning--20707.org.readthedocs.build/en/20707/

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu-guardian	success	✅

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/callback_connector.py.

🟢 pytorch_lightning: Azure GPU

Check ID	Status
pytorch-lightning (GPUs) (testing Lightning | latest)	success	✅
pytorch-lightning (GPUs) (testing PyTorch | latest)	success	✅

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/callback_connector.py.

🟢 pytorch_lightning: Benchmarks

Check ID	Status
lightning.Benchmarks	success	✅

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/callback_connector.py.

🟢 pytorch_lightning: Docs

Check ID	Status
docs-make (pytorch, doctest)	success	✅
docs-make (pytorch, html)	success	✅

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/callback_connector.py.

🟢 mypy

Check ID	Status
mypy	success	✅

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/callback_connector.py.

🟢 install

Check ID	Status
install-pkg-guardian	success	✅

These checks are required after the changes to src/lightning/pytorch/trainer/connectors/callback_connector.py.

---

Thank you for your contribution! 💜

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79%. Comparing base (cd785a4) to head (041a89d).
Report is 134 commits behind head on master.

✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (cd785a4) and HEAD (041a89d). Click for more details.

HEAD has 576 uploads less than BASE

Flag	BASE (cd785a4)	HEAD (041a89d)
cpu	156	27
python	13	3
lightning_fabric	36	0
pytest	81	0
python3.10	36	6
python3.12.7	53	9
python3.12	18	3
lightning	90	15
python3.11	36	6
gpu	3	0
pytorch2.1	15	6
pytorch_lightning	33	12
pytest-full	78	27
pytorch2.2.2	9	3
pytorch2.3	9	3
pytorch2.5	9	3
pytorch2.4.1	9	3
pytorch2.7	9	3
pytorch2.6	9	3
pytorch2.5.1	9	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #20707     +/-   ##
=========================================
- Coverage      87%      79%     -8%     
=========================================
  Files         268      265      -3     
  Lines       23449    23394     -55     
=========================================
- Hits        20389    18386   -2003     
- Misses       3060     5008   +1948