[Combo button] Image correction for images having button title as "Actions"

[alina-jacob]

Problem:

The combo button has two buttons, primary and icon-only primary button. The primary button should have a title "Primary action"
Currently some of the images in the usage and style tab have the button title as "Actions"

Solution:

• Update the button text from "Actions" to "Primary action" for 4 images (2 each in the Usage and Style tab)
• Raise a PR