Included a few more details on will
Included a few more details on will

Looking mainly at the roast test:
https://github.com/perl6/roast/blob/fca87f2030d5cab6fc8460e5b195aecd9b7765b2/S04-declarations/will.t

Some not implemented here, but at least an example of those phasers
excluded could be added. Not sure the issue is current, anyway, since
it said which phasers could be used this way. Closes #1553 anyway.

perl6/doc,jonathanstowe/doc,stmuk/doc,perl6/doc,stmuk/doc,perl6/doc,tbrowder/doc,stmuk/doc,perl6/doc,stmuk/doc,jonathanstowe/doc,stmuk/doc,tbrowder/doc,perl6/doc,dmaestro/doc,MasterDuke17/doc,jonathanstowe/doc,dmaestro/doc,tbrowder/doc,dmaestro/doc,dmaestro/doc,MasterDuke17/doc,MasterDuke17/doc,jonathanstowe/doc,tbrowder/doc,jonathanstowe/doc,MasterDuke17/doc,dmaestro/doc