System settings table separator using h3

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.X, 7.2.X, 7.3.X, Master
• Fix Version/s: 7.4.3.34 CE GA34, 7.4.3.35 CE GA35, Master
• Component/s: Portal Configuration > System Settings
• Labels:
  • 7.4.13-u34
  • QA-V
  • usm-board-out
  • usm_73_reproducible
• Fix Priority: 2
• Epic Link: Headings
• Git Pull Request: https://github.com/liferay-echo/liferay-portal/pull/8924
• Bug Type: Accessibility

Remove h3. Make it label 12px, semibold, dark L3 (#6b6c7e)