The rdoc heading for Array[index] method says:

array[index] = obj вк obj

and for String.new:

String.new(str="") => new_str

When I document my own classes, how do I make the part that shows return
values with the arrow appear? i.e. change_array(old_array) => new_array

I don't know how to comment my code such that the "=> new_array" would
appear in rdoc.

Thank you.
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