docs: update towncrier template

[germa89]

Description

As the title.

Issue linked

NA

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

[ansys-reviewer-bot]

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[github-actions]

The towncrier template has been successfully rewritten with the default template.
Please ensure that sphinx-design is included as a dependency in your project's documentation requirements.
Additionally, add sphinx-design to the extensions list in your conf.py file.
For more information, please refer to the migration guide at:
https://actions.docs.ansys.com/version/stable/migrations/index.html#migration-guide

Migration guide — Ansys Actions

[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬

[germa89]

@klmcadams for info... and approval.

• Please ensure that sphinx-design is included as a dependency in your project's documentation requirements.
• Additionally, add sphinx-design to the extensions list in your conf.py file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.36%. Comparing base (c9f0348) to head (edd9bea).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3786      +/-   ##
==========================================
- Coverage   88.42%   88.36%   -0.07%     
==========================================
  Files         187      187              
  Lines       14738    14738              
==========================================
- Hits        13032    13023       -9     
- Misses       1706     1715       +9     

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