-mlong, -mshort-double and -mlong-double options; use table @code.
(M68HC11-Syntax): Update to document 68HC12 operands.
(M68HC11-Modifiers): New section for operand modifiers.
(M68HC11-Directives): New section for specific assembler directives.
(M68HC11-Branch): Fix Overfull hbox error.