code: Description createErrorDescription(
        ErrorMessage errorMessage, TreePath path, Description.Builder descriptionBuilder) {
      Tree enclosingSuppressTree = suppressibleNode(path);
      return createErrorDescription(errorMessage, enclosingSuppressTree, descriptionBuilder);
    }
docs: create an error description for a nullability warning
  
  @param errorMessage the error message object.
  @param path the TreePath to the error location. Used to compute a suggested fix at the
  enclosing method for the error location
  @param descriptionBuilder the description builder for the error.
  @return the error description