Update finnish.md

[onnimonni]

I checked few main sites from the tranco list with duckdb:

INSTALL netquack FROM community;
LOAD netquack;

-- Creates a tranco csv for yesterday
SELECT update_tranco(TRUE);

SET VARIABLE tranco_csv = (SELECT format('tranco_list_{}.csv',TODAY()-1));

SELECT column0 as rank, column1 as url
FROM read_csv(getvariable('tranco_csv'))
WHERE extract_tld(url) ='fi'

This approach is probably useful for other smaller countries as well since I would not have been able to come up with many of these without this list.

[thunderpoot]

Thank you very much @onnimonni and @iiska for these additions, however please avoid changing the structure of the document. Please add the links to the standard categories. Cheers!