embed.fnc: Sort a list in comments

There are now enough items, that sorting is helpful to reading

Author: khwilliamson

embed.fnc

@@ -315,15 +315,15 @@
 : like 'int' or 'char', and 'cast' by perhaps 'struct foo'.
 :
 : The complete list of conventions is:
-:  type     the argument names a type
-:  cast     the argument names a type which the macro casts to
-:  SP       the argument is the stack pointer, SP
 :  block    the argument is a C brace-enclosed block
+:  cast     the argument names a type which the macro casts to
 :  number   the argument is a C numeric constant, like 3
-:  token    the argument is a generic C preprocessor token, like abc
+:  SP       the argument is the stack pointer, SP
 :  "string" the argument is a literal C double-quoted string; what's important
 :	    here are the quotes; for clarity, you can say whatever you want
 :	    inside them
+:  token    the argument is a generic C preprocessor token, like abc
+:  type     the argument names a type
 :
 : Unlike other arguments, none of these is of the form 'int name'.  There is no
 : name.