Doc: Fix issues in the Qt licenses table

Fix a number of broken links in the licenses table, as well
as a few incorrect license types and component descriptions.

Add empty rows in strategic locations in the table to make
it look better with the alternating row colors.

Task-number: QTBUG-35362
Change-Id: I12956a65b94f79884a56566410658e0e8c293804
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Nico Vertriest <nico.vertriest@digia.com>
Reviewed-by: Sami Makkonen <sami.makkonen@digia.com>