BUG #16401: Minor misspelling for hint in Swedish

The following bug has been logged on the website:

Bug reference:      16401
Logged by:          Lennart Jonsson
Email address:      erik.lennart.jonsson@gmail.com
PostgreSQL version: 12.2
Operating system:   Fedora 31
Description:

When running psql one gets helpful hints on how to fix a broken query. There
is a misspelt word in the Swedish translation:
                                                           ^
HINT:  Kanske tänkte du referera *trill* kolumnen "s1.indextyp".

Should read:

HINT:  Kanske tänkte du referera *till* kolumnen "s1.indextyp".

"referera till" means "refer to". Trill is a - rather unusual - noun,
meaning vibrant