docs: def call_env_before_read_docs(cls, kb_app, sphinx_app: Sphinx,
                                    sphinx_env: BuildEnvironment,
                                    docnames: List[str]):
          """ On env-read-docs, do callbacks"""
  
          for callback in EventAction.get_callbacks(kb_app,
                                                    SphinxEvent.EBRD):
              callback(kb_app, sphinx_app, sphinx_env, docnames)