fix(script-query): Script query help should reference pandas instead

[adityahase]

pandas = frappe._dict()
pandas.DataFrame = pd.DataFrame
pandas.read_csv = pd.read_csv
pandas.json_normalize = pd.json_normalize

Reference: https://github.com/frappe/insights/blob/develop/insights/insights/doctype/insights_query/insights_script_query.py#L118-L130