Enhance JavadocManagerUtil to also show comments for a class.

• Type: Story
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: 6.2.0 CE M5
• Fix Version/s: 6.2.0 CE M5
• Component/s: Legacy, Legacy > API
• Labels: None
• Epic/Theme:
  • Platform
• Story Points: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/10514

+ upgrade JavadocManagerUtil to also load comments for a class. Right now, we can, at runtime load comments for methods in e.g. UserLocalServiceImpl, but now we want them for the class itself. It's already stored in our javadocs-rt.xml file, we just need the Java API to call it.

+ Update localhost:8080/api for all the JSON instructions to also post the comments for the class (besides the comments that are already there).