Add more explanations in the Developer Documentation

[yshkk]

Developer Documentation now only shows some figures and it could be much easier to understand if some explanations of those figures are clarified, especially the last 2 figures.Thanks:)

[danlamanna]

Developer Documentation now only shows some figures and it could be much easier to understand if some explanations of those figures are clarified, especially the last 2 figures.Thanks:)

Thanks for the suggestion, if I remember correctly those were added to aid the conference presentation about GeoNotebook at JupyterCon. Those diagrams get a bit more explanation in that talk: https://www.youtube.com/watch?v=s82yE1gOuks&index=18&list=PL055Epbe6d5aP6Ru42r7hk68GTSaclYgi

[aashish24]

@yshkk once you look at the video, let us know if you have any specific suggestions or if you can create a PR.