Wrote some doc a fixed some issues

docs/source/execution.rst

docs/source/index.rst

docs/source/monomulti/utils/execution.rst

docs/source/monomulti/utils/multiclass.rst

docs/source/monomultidoc.rst

multiview_platform/MonoMultiViewClassifiers/ExecClassif.py

multiview_platform/MonoMultiViewClassifiers/utils/Dataset.py

...iew_platform/MonoMultiViewClassifiers/utils/Multiclass.py

...view_platform/MonoMultiViewClassifiers/utils/execution.py

multiview_platform/Tests/test_ExecClassif.py