doc: New note with markup for the function's Doxygen document.

A new note explains the correct ReST markup for links to the functions
in the API documentation extracted by Doxygen.

Change-Id: Ifd61794445bc559485dd4034ae68897271837939
Signed-off-by: Rodrigo Caballero <rodrigo.caballero.abraham@intel.com>
1 file changed