Issue #480: Use "Stan" not "stan"

[athowes]

Description

This PR closes #480.

Using find in files I didn't find other instances of the full word "stan" that should be replaced.

Checklist

• My PR is based on a package issue and I have explicitly linked it.
• I have included the target issue or issues in the PR title in the for Issue(s) issue-numbers: PR title
• I have read the contribution guidelines.
• I have tested my changes locally.
• I have added or updated unit tests where necessary.
• I have updated the documentation if required.
• My code follows the established coding standards.
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• I have reviewed CI checks for this PR and addressed them as far as I am able.

[seabbs]

Is this meant to still be a draft?