Main Resources table needs to be less verbose

With appreciation for the intent and SAK-11668, the table summary is excessively verbose, and practically the information it provides is too much without the context of the table's actual contents as to be useful.

Summary should not include column descriptions.

Please remove headings <h3> from within the table.

Add scope attributes to the column headers; and change td to th in the third column, row 2 and down, use scope=”row”.