Update dd style in API docs.

Only make the font size 12px for the special note, warning, etc. blocks
not all dd blocks.
Color parameters grenadier (orange) in API docs.
Color parameters in parameter lists grenadier (orange) as well.
A few doc fixes to BApplication and BHandler.

* Since <em> is used for parameters we can't use it for emphasis.
* Add \a in a few places it was missing to indicate a parameter.
* Change \a to a \c in one instance, param -> constant.
* Lots of whitespace fixes, most just deleting leading tabs.
* Don't indent code blocks, they should be flush to left since any
  indentation is preserved in the output.