bug#3450: 23.0.91; HELLO file: Finnish name for language is "suomi"

Here's a minor but easily fixable bug in HELLO file (C-h h). In the file
Finnish name for our language is written in capital letters but it
should be in small letters. Capital "Suomi" means our country; "suomi is
the language. I'd also write "hyvää" in small letters because it doesn't
begin a new sentence. So this would be the correct version:

Finnish (suomi)                 Hei, hyvää päivää
         ^                           ^

Yes, I'm a Finnish teacher. :-)