XR Plug-in Management: Help box UI issues — icon is not visible and link is out of place

Steps to reproduce:

1. Create a project
2. Go to "Edit" -> "Project Settings"
3. Select the "XR Plug-in Management" item
4. Observe the displayed help box

Actual results: Help box is displayed without the icon. "View Documentation" is in the wrong position

Expected results: The icon should be displayed on the left side of the help box. "View Documentation" link should be moved to the right side of the box

Reproducible with versions: 4.5.4 (6000.5.0a9, 6000.6.0a1)

Tested on (OS): macOS - Tahoe 26.3.1