criptions according to starting substring. 

    Parameters
    ----------
    df : pandas.DataFrame
        Dataframe containing all the well descriptions
    terms_df : pandas.DataFrame
        Dataframe containing all the startswith substrings to use for searching
    description_col : str, default = &#39;FORMATION&#39;
        Name of column in df containing descriptions, by default &#39;FORMATION&#39;
    terms_col : str, default = &#39;FORMATION&#39;
        Name of column in terms_df containing start