[Reflection\rational?] add documentation example

[github-actions[bot]]

[Reflection\rational?] add documentation example

https://github.com/arturo-lang/arturo/blob/3a89302d1b1f33da097ed6e7bd6dfb05fc338482/src/library/Reflection.nim#L697

    builtin "quantity?",
        alias       = unaliased, 
        rule        = PrefixPrecedence,
        description = "checks if given value is of type :quantity",
        args        = {
            "value" : {Any}
        },
        attrs       = NoAttrs,
        returns     = {Logical},
        # TODO(Reflection\quantity?) add documentation example
        #  labels: library, documentation, easy
        example     = """
        """:
            ##########################################################
            push(newLogical(x.kind==Quantity))

    builtin "rational?",
        alias       = unaliased, 
        rule        = PrefixPrecedence,
        description = "checks if given value is of type :rational",
        args        = {
            "value" : {Any}
        },
        attrs       = NoAttrs,
        returns     = {Logical},
        # TODO(Reflection\rational?) add documentation example
        #  labels: library, documentation, easy
        example     = """
        """:
            ##########################################################
            push(newLogical(x.kind==Rational))

    builtin "regex?",
        alias       = unaliased, 
        rule        = PrefixPrecedence,

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