Given a list-column containing column-names for targets (As part of a
drake::drake_plan() having been processed by extract_column_names()),
cross reference these columns with the lookup_cache, and produce html tables
for each set of columns.
link_col2doc(target_column_list, lookup_cache)
| target_column_list | a list of character vectors specifying column names | 
|---|---|
| lookup_cache | the  | 
a list column, of the same length as the outer dimension of the input list, each element being a dataframe describing each column.
Other graph_decoration: 
decorate_plan(),
extract_column_names()