documentation for the macro "role_transition_definition"

writes out role transition permissions of a given role in SELinux syntax.

It is defined in the file sets.m4.

m4 code:

define(`role_transition_definition',
`allow $1 patsubst(patsubst(notmember(`
$1
',patsubst(`role_transitionsX$1',`
',`)notmember(`
$1
',')),`
$',),`
',;
allow $1 );
')