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Fix documentation for :type Array notation to be different from :types (#2758)

Without a custom to_s, type: [Integer, String] serialised to a garbage
object string in route.params[:type], making it indistinguishable from
the VariantCollectionCoercer instance address. Documentation tools
(grape-swagger, grape-oas) could not tell it apart from the plain-array
"[Integer, String]" produced by the types: keyword.

Now type: [Integer, String] produces "Array[Integer, String]" and
type: Set[Integer, String] produces "Set[Integer, String]", matching
the Grape DSL notation and letting tooling generate the correct schema
(array with variant-member items vs oneOf at the parameter level).

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