trafgen: lexer: also allow short forms for hex and binary

Also allow for ...

 - hex:		0xff, xff
 - binary:	0b11110000, b11110000

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
man: trafgen: update documentation for hex, bin forms

Also update examples for the man-page.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
docs: minor: fix mentioning of Documentation/

The Documentation/ folder no longer exists. Either everything important
can be found in the man pages or other documentation files. Fix the
mentioning of Documentation/.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>