Fix content margin at the bottom of scrollable modal

[hannahiss]

Related issues

Fixes #1602

Description

Removed rule to prevent scrollable modals to not having bottom margin on last paragraph of modal-body (in contrary of other modals)

Motivation & Context

Resolves design problem of having a too big margin at the bottom of scrollable modals

Types of change

• Bug fix (non-breaking which fixes an issues)

Live previews

• https://deploy-preview-1661--boosted.netlify.app/docs/5.2/components/modal/#scrolling-long-content

Checklist

• I have read the contributing guidelines
• My code follows the code style of the project (using npm run lint)
• My change introduces changes to the documentation
• My change introduces changes to the migration guide
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

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[sonarcloud]

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