class_docstr: Transformation that leverage pre-defined spelling mistake dictionary to
  simulate spelling mistake.
  
  https://arxiv.org/ftp/arxiv/papers/1812/1812.04718.pdf
code: def __repr__(self):
      return "SpellingError"
  
file_path: textflint/textflint/generation/transformation/UT/spelling_error.py
imports: from ...transformation import WordSubstitute
  from ....common.settings import SPELLING_ERROR_DIC
  from ....common.utils.install import download_if_needed
label_desc: Use image node_id 2 for calling the SpellingError obj's underlying member method code with example usage: obj.__repr__() and returns: str