Small erratas in documentation

[RaulPPelaez]

I sometimes see small incoherences in the docs and I thought it would be a good idea to post them somewhere as I encounter them. Again, very little not-so-harmful things.

I believe they are erratas, but maybe it is just me missing out something obvious, so in that case please correct me.

I will be posting them here:
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In https://nvlabs.github.io/cub/classcub_1_1_transform_input_iterator.html

There is a code example with a struct such as:

// Functor for tripling integer values and converting to doubles
struct TripleDoubler

{
    __host__ __device__ __forceinline__
    double operator()(const int &a) const {

        return double(a * 2);

    }

};

Should not it be return double(a*3) ???

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