fix: Change gal to US gallons

[raarielgrace]

Pull Request Standards

• The title of the PR is accurate
• The title includes the type of change [HOTFIX, FEATURE, etc]
• The PR title includes the ticket number in format of [NMP-###]
• Documentation is updated to reflect change

Description

This PR includes the following proposed change(s):

• Clarified gal as US gal

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[lunamoonmoon]

You go gal (US)!