Remove chemistry dep warning

[kratman]

Description

Remove the old deprecation warning for the chem argument. It was from March 2023, so over a year old

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python run-tests.py --all (or $ nox -s tests)
• The documentation builds: $ python run-tests.py --doctest (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ python run-tests.py --quick (or $ nox -s quick).

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[agriyakhetarpal]

I know that this is quite old and probably isn't in use anywhere either, but could you please add a CHANGELOG entry, too?

[kratman]

I know that this is quite old and probably isn't in use anywhere either, but could you please add a CHANGELOG entry, too?

Yeah I was planning on it, I just needed to create the PR so I had the correct number

[agriyakhetarpal]

I know that this is quite old and probably isn't in use anywhere either, but could you please add a CHANGELOG entry, too?

Yeah I was planning on it, I just needed to create the PR so I had the correct number

You might like https://ichard26.github.io/next-pr-number/, I use it quite frequently for this purpose

[arjxn-py]

Suggested change

	- Added phase-dependent particle options to LAM
	([#4369](https://github.com/pybamm-team/PyBaMM/pull/4369))
	- Added phase-dependent particle options to LAM ([#4369](https://github.com/pybamm-team/PyBaMM/pull/4369))

[kratman]

Both of those render why does this matter?

[agriyakhetarpal]

I think it would split up into a new line on https://pybamm.org/changelog/

[kratman]

It is already a bulleted list in that page, if that does not work then there is something wrong with the library used for it

[agriyakhetarpal]

Now that I notice, that page is outdated and does not show any results since 24.1 was last released

[agriyakhetarpal]

In other words, the Goldmark renderer for Hugo has an option to wrap text, will check if it's enabled

[arjxn-py]

Thanks @kratman

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.46%. Comparing base (1b6ef03) to head (a979e62).
Report is 180 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4466   +/-   ##
========================================
  Coverage    99.46%   99.46%           
========================================
  Files          293      293           
  Lines        22384    22386    +2     
========================================
+ Hits         22264    22266    +2     
  Misses         120      120           

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