docs are incomplete or wrong...

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/17/tutorial-createdb.html
Description:

Folowing the online docs @
https://www.postgresql.org/docs/17/tutorial-createdb.html
it says: "To create a new database, in this example named mydb, you use the
following command:

$ createdb mydb"
When performing it error comes:
"createdb: error: connection to server on socket
"/var/run/postgresql/.s.PGSQL.5432" failed: FATAL:  role "root" does not
exist"
No matter what explanation there is for it, this is supposed to be official
documentation. It MUST be right.