Fix Markdown parameter rendering due to empty line after row

[colinrotherham]

This issue prevented tables with multiple rows from rendering correctly

It was caused by prettier --write when run on Markdown files in https://github.com/alphagov/govuk-frontend-docs/commit/df2fe5e4b9fc7aa306ad2595a7e75c0f914931c9

Sass API reference

The rendering issue was not present in the v4.x documentation as shown:

• Spacing mixin govuk-responsive-margin on v4.x
• Spacing mixin govuk-responsive-margin on v5.x – broken on main
• Spacing mixin govuk-responsive-margin on v5.x – fixed in this PR

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