Static spacing override classes don't start with govuk-!-static (as documented)

[vanitabarrett]

Description of the issue

As raised by a user in the govuk-design-system repo, the static spacing override classes are not in the same format as they're documented. Classes should start with govuk-!-static, but instead are formatted like this: govuk-!-margin-static (for example).

Steps to reproduce the issue

Try and use govuk-!-static-margin-2 class - nothing will be applied.

Actual vs expected behaviour

govuk-!-margin-static-2 class (for example) should be govuk-!-static-margin-2

Environment (where applicable)

• GOV.UK Frontend Version: 4.3.0

Done When

• Raise a PR to add the new correct class, alongside the old class
• Deprecate the old class
• Create a ticket to remove the deprecated class in the next major release, and add it to the v5.0.0 milestone