Update index.md

Author: ChrisRackauckas

docs/src/index.md

@@ -345,14 +345,3 @@ These all have the same interface, where `J*v` utilizes the out-of-place
 Jacobian-vector or Hessian-vector function, whereas `mul!(res,J,v)` utilizes
 the appropriate in-place versions. To update the location of differentiation
 in the operator, simply mutate the vector `u`: `J.u .= ...`.
-
-# Note about sparse differentiation of GPUArrays, BandedMatrices, and BlockBandedMatrices
-
-These two matrix types need the dependencies ArrayInterfaceBandedMatrices.jl and
-ArrayInterfaceBlockBandedMatrices.jl to basically work with any functionality
-(anywhere). For now, the right thing to do is to add these libraries and do
-`import` on them if you are using BandedMatrices.jl or BlockBandedMatrices.jl
-for sparsity patterns. In the future, those two packages should just depend on
-ArrayInterface.jl and remove this issue entirely from the user space.
-
-Additionally, GPUs need ArrayInterfaceGPUArrays for proper determination of the indexing.