Tweaks from code review

CHANGELOG.md

@@ -6,13 +6,11 @@
 You must make the following changes when you migrate to this release, or your service may break.
 
 #### Remove deprecated $govuk-border-width-form-element-error
-The [border width of form elements in their error state](https://github.com/alphagov/govuk-frontend/pull/1870) is now the same as form elements in their normal state.
+In v3.8.0, we made the [border width of form elements in their error state](https://github.com/alphagov/govuk-frontend/pull/1870) the same as form elements in their normal state and deprecated `$govuk-border-width-form-element-error`.
 
-To make this change, we've removed the `$govuk-border-width-form-element-error` setting.
+We've now removed `$govuk-border-width-form-element-error` completely.
 
-If you’re referencing `$govuk-border-width-form-element-error` (for example, in your own components), you must remove this setting. Otherwise, if users changed the `$govuk-border-width-form-element`, you would have to conditionally add overrides to maintain a consistent focus state.
-
-You can still change the border colour. For example, you can replace `border: $govuk-border-width-form-element-error solid $govuk-error-colour;` with `border-color: $govuk-error-colour;`.
+If you’re referencing `$govuk-border-width-form-element-error` in your own Sass, you must remove this setting. If you are defining your own error state, you only need to change the border colour. You should avoid overriding the border thickness. For example, replace `border: $govuk-border-width-form-element-error solid $govuk-error-colour;` with `border-color: $govuk-error-colour;`.
 
 If you’re overriding `$govuk-border-width-form-element-error` in your CSS, this will no longer work - so we advise you to remove this override.