camera2: Fix @see being emitted into middle of javadoc (+more)

Other minor fixes:
- javadoc optional/FULL correctly emitted for properties lacking details
- javadoc details being incorrectly dedented before being rendered by
  markdown, causing spurious <code> blocks to be emitted

Bug: 12552669
Change-Id: I4c6615ec47810757b8348995db2b199222a3a77e