ENH : Update doc generation for our new Python API and news chains

doc_cookbook/generate_cookbook.txt

doc_cookbook/rst_API_Python/SAR_MultiSlc.rst

doc_cookbook/rst_API_Python/SAR_MultiSlc_IW.rst

doc_cookbook/rst_API_Python/modules.rst

doc_cookbook/rst_API_Python/processings.rst

python_src/SAR_MultiSlc.py

python_src/SAR_MultiSlc_IW.py

python_src/diapOTB.py

python_src/diapOTB_S1IW.py

python_src/processings/DInSar.py

python_src/processings/Ground.py

python_src/processings/Metadata_Correction.py

python_src/processings/Pre_Processing.py

python_src/utils/DiapOTB_applications.py