code: def load_file(cls, package_name, root_dir, relative_dirs):
          
          extension = "[!.#~]*.md"
  
          file_matches = dbt.clients.system.find_matching(
              root_dir,
              relative_dirs,
              extension)
  
          for file_match in file_matches:
              file_contents = dbt.clients.system.load_file_contents(
                  file_match.get('absolute_path'), strip=False)
  
              parts = dbt.utils.split_path(file_match.get('relative_path', ''))
              name, _ = os.path.splitext(parts[-1])
  
              path = file_match.get('relative_path')
              original_file_path = os.path.join(
                  file_match.get('searched_path'),
                  path)
  
              yield UnparsedDocumentationFile(
                  root_path=root_dir,
                  resource_type=NodeType.Documentation,
                  path=path,
                  original_file_path=original_file_path,
                  package_name=package_name,
                  file_contents=file_contents
              )
docs: Load and parse documentation in a list of projects. Returns a list
          of ParsedNodes.