Add comment where aux image atomic buffers are reflected from.
Add comment where aux image atomic buffers are reflected from.

They also use secondary bindings, not just samplers.

KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross