Sets question preface text for multiple variables at once using named arguments.
See also
set_question_preface() for setting a single question preface
Other metadata:
extract_question_preface(),
extract_val_labels(),
extract_var_label(),
extract_var_note(),
infer_question_prefaces(),
set_question_preface(),
set_val_labels(),
set_value_labels(),
set_var_label(),
set_var_note(),
set_variable_labels(),
set_variable_notes(),
survey_metadata(),
survey_weighting_history()