Change multi sources.list entry example from FTP to HTTPS

As the FTP method is dropped it is probably better to use an example
that actually works. We use https here as that requires no other text
changes as there is a HTTPS session to reuse similar to FTP usage ~ that
is the case for our HTTP, too, but the concept of a session isn't
usually known there and servers who close the connection after every
request are more common.

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