`Array#*` with a string literal is not working

[Shozo Hatta]

goby/vm/array.go

Line 95 in c52b53e

 // a * ',' # => "1,2,3" 

I found that the current implementation does not support the syntax like [1, 2, 3] * ',' while this works in Ruby.

But I think that the syntax is redundant and #join should be used instead.

Shall I delete the line in the API document?

[Stan Lo]

@hachi8833 yes please

[Shozo Hatta]

Got it!
Now I'm updating the current API documents and would send the PR for that.