various API doc updates for content and formatting, refs #7461 !strict.
various API doc updates for content and formatting, refs #7461 !strict.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@16606 560b804f-0ae3-0310-86f3-f6aa0a117693

cjolif/deliteful,kitsonk/deliteful,EAlexRojas/deliteful,cjolif/deliteful,harbalk/deliteful,kitsonk/deliteful,brunano21/deliteful,tkrugg/deliteful,brunano21/deliteful,harbalk/deliteful,tkrugg/deliteful,EAlexRojas/deliteful