doc: update DoxyFile to doxygen ver 1.8.3.1
pfx: remove doxygen annotation for non-existent parameter

Remove documentation for parameter socket_id of pfx_table_remove(..).
The parameter socket_id doesn't exist anymore.
src: remove typedefs for enums

remove all typedefs for enum, they don't provide any benefit, only
hiding the real type
pfx: add missing doxygen documentation for function arg

add documentation for socket parameter of pfx_table_remove() function.