corrected spelling of milliliter

[Jonopono123]

What

Corrected spelling of "Millliiter" to "Milliliter".

Why

This was a typo in the unit mapping and needs correcting.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Internal change (non-breaking change with no effect on the functionality affecting end users)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have performed a self-review of my code
• My changes generate no new warnings
• I have updated the Changelog with details of my change in the UNRELEASED section if this change will affect end users

[github-actions]

Looks good. No mutations were possible for these changes.
See https://pitest.org

• Arcmutate licence valid until 2028-03-02 (yyyy/mm/dd) (non-commercial use only)
• Project uses Spring, but the Arcmutate Spring plugin is not present.

[github-actions]

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