Document how try works, and what resume is doing

[briandfoy]

I can't give a better title for this issue because there are so many hidden things I'm still unaware of. Jonathan explained some of them in his answer to Should this Perl 6 CATCH block be able to change variables in the lexical scope?.

[AlexDaniel]

• try itself is explained here: https://docs.perl6.org/language/exceptions#try
• resume is mentioned in https://docs.perl6.org/language/exceptions#Resuming_of_Exceptions

Can we have a todo list of things that should be done? I'll start:

• use fatal is not mentioned

[tbrowder]

This resume section example mentioned by @AlexDaniel needs to be shown in a loop or other block to clearly show control flow with output.