neuron_viewer: Manually wrapped a few doctrings that were a little long.
batch_learner: Manually wrapped a few doctrings that were a little long.
advanced_iterators: Added docstrings. Reran Sphinx to catch the changes.
advanced_iterators: Added comments. Reran Sphinx to catch the changes (as it has a code viewer, which shouldn't be affected).
random_dictionary_learning_data: As this was moved to tests, the documentation of it has been removed from Sphinx.