Add docs for ##[] commands from scripts about toolkit HOT 6 CLOSED

We will support ## for a few months and advise / sunset. The new syntax is the same but uses :: instead of ##. It's supposed to be rolling to rings any day now (and might be in yours as I write this).

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This is changing to ::

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Yes curious to know what this @damccorm as saw a few commits/lines in other actions such as actions/setup-node etc...

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We will document. The ## was problematic as that's a comment in bash so it require quoting which was inconsistent across platforms. The latest version of the runner has the changes so it's now ::. Now that it has rolled out, we will doc for scripts and the toolkit will react.

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I am currently using the following bash function to wrap commands in groups:

pgroup () {
  printf '##[group]'
    echo "$@"
    "$@"
  echo '##[endgroup]'
}

Although @bryanmacfarlane commented that it changed 3 days ago, it is still working. Will this break? Or is it independent from this issue?

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Added docs in #105 if anyone is still looking for guidance/wants to take a look

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