MNT: Update speckle notebook to not use top-level heading
MNT: Update speckle notebook to not use top-level heading

sameera2004/scikit-xray-examples,scikit-xray/scikit-xray-examples,scikit-beam/scikit-beam-examples,hainm/scikit-xray-examples,Nikea/scikit-xray-examples,sameera2004/scikit-beam-examples