Document statement prefixes

[JJ]

The problem

There are some references here and there, like gather, or do, but they are not documented in a single place. Here are the definitions in Actions:

https://github.com/rakudo/rakudo/blob/master/src/Perl6/Actions.nqp#L2348-L2634

List of statement prefixes:

• [x] quietly
• [x] try
• [x] sink
• [x] race
• [x] hyper
• [x] eager
• [x] lazy
• [x] start
• [x] once
• [x] react
• [x] supply
• [x] gather
• [x] do
• [ ] phasers: BEGIN, CHECK...

Suggestions

Probably create a new page, include it in the #114 roadmap.

[rafaelschipiura]

534 related.

[2colours]

For supply, is this not good enough?

If it is, I would rather close this issue and see if phasers need another one.