class_docstr: Abstract class for a documentation Section (description, homepage, ...).
docstr: Get the key of the section.
  
  The key is used to merge similar sections across builder configs. For
  instance, https://www.tensorflow.org/datasets/catalog/wiki40b only display
  once the `FeatureDict`, homepage,... as those sections are the same for
  all configs.
  
  Args:
    loader: The loader of the DatasetCollection to document.
  
  Returns:
    key: The section key.
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code: def get_key(
      self, loader: tfds.core.DatasetCollectionLoader
  ) -> dmb.Key:
      """Get the key of the section.
  
      The key is used to merge similar sections across builder configs. For
      instance, https://www.tensorflow.org/datasets/catalog/wiki40b only display
      once the `FeatureDict`, homepage,... as those sections are the same for
      all configs.
  
      Args:
        loader: The loader of the DatasetCollection to document.
  
      Returns:
        key: The section key.
      """
      pass
  
imports: import abc
  import textwrap
  from typing import List
  import tensorflow_datasets
  from tensorflow_datasets.scripts.documentation import dataset_markdown_builder
  from tensorflow_datasets.scripts.documentation import doc_utils
label_desc: Use image node_id 1 for calling the CollectionSection obj's underlying member method code with example usage: obj.get_key(loader) without return types