Update model_checkpoint.py

[happyfox-dot]

Modify the typing error! :paramref:-> :param:

What does this PR do?

Modify the typing error in comments!

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---

📚 Documentation preview 📚: https://pytorch-lightning--20247.org.readthedocs.build/en/20247/

[lantiga]

paramref is correct in this case

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81%. Comparing base (5be58f6) to head (4e36aef).
Report is 81 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (5be58f6) and HEAD (4e36aef). Click for more details.

HEAD has 553 uploads less than BASE

Flag	BASE (5be58f6)	HEAD (4e36aef)
cpu	147	21
lightning	106	16
pytest	87	2
python3.9	43	6
python3.10	42	6
lightning_fabric	25	0
gpu	4	2
python3.11	42	6
python3.12	20	3
pytorch2.1	38	12
pytest-full	64	21
pytorch2.3	9	3
pytorch_lightning	20	7
pytorch2.2	9	3
pytorch2.4	8	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #20247     +/-   ##
=========================================
- Coverage      89%      81%     -8%     
=========================================
  Files         267      264      -3     
  Lines       23084    23029     -55     
=========================================
- Hits        20585    18618   -1967     
- Misses       2499     4411   +1912