Add preview in content display for documents

• Type: Story
• Status: Awaiting PM Review
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: Publications
• Labels:
  • 7.4-portal-ga5
  • fc_21_09
  • fc_21_10
  • fc_21_11
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/108484

Try to get preview working within getContent() without api changes