Content - add support for editorial/long-form styles

[mcoker]

re: https://github.com/patternfly/patternfly/pull/6952

Adds support for .pf-m-editorial on all of the .pf-v6-c-content* classes, so it can be used on:

• The outer .pf-v6-c-content, which will style all of the content components inside of it
• Individual .pf-v6-c-content--* elements to style that particular thing