* New c-mode Doxygen function documentation using Javadoc style tags.
* Removed double space from doc block.
* Moved alternate c/c++ function documentation block from c-mode to
c-lang-common so that the snippet will be available for both c & c++
programs.
* Reformatted c function Doxygen documentation block. Added @details
section.
* Changed C Doxygen function block trigger to doxy to make it easier to
use. Added new nasm Doxygen function block document snippet.