Minor issue with `.page-header` in Migration docs

Created by: iatek

The Typography section of migration.md states:

"Dropped .page-header as, aside from the border, all its styles can be applied via utilities."

Should this instead state...

"Dropped .page-header as all its styles can be applied via utilities."

Since border-bottom can be used to get a similar border-bottom like the 3.x .page-header class had?

Page header using only util classes:

<div class="pb-2 mt-4 mb-2 border-bottom">
        Page header
</div>