edit docstrings and docs

autoaug/autoaugment_learners/AaLearner.py

autoaug/autoaugment_learners/EvoLearner.py

autoaug/autoaugment_learners/GruLearner.py

autoaug/autoaugment_learners/RsLearner.py

autoaug/autoaugment_learners/UcbLearner.py

docs/source/_static/logohd.png

...ug/aa_learners/autoaug.autoaugment_learners.AaLearner.rst

...g/aa_learners/autoaug.autoaugment_learners.EvoLearner.rst

...g/aa_learners/autoaug.autoaugment_learners.GruLearner.rst

...ug/aa_learners/autoaug.autoaugment_learners.RsLearner.rst

...g/aa_learners/autoaug.autoaugment_learners.UcbLearner.rst

docs/source/autoaug/api_reference.rst

docs/source/autoaug/auto_augmentation_learners.rst

docs/source/autoaug/autoaugment_learners.rst

...oaug/generated/autoaug.autoaugment_learners.AaLearner.rst

...aug/generated/autoaug.autoaugment_learners.EvoLearner.rst

...aug/generated/autoaug.autoaugment_learners.GruLearner.rst

...oaug/generated/autoaug.autoaugment_learners.RsLearner.rst

...aug/generated/autoaug.autoaugment_learners.UcbLearner.rst

docs/source/index.rst