doc: Use tags consistently in the tutorial chapter

Peter Eisentraut <peter@eisentraut.org>

Commit: 6eee73e4e5b6d499f1a5529f209ce4af86ef5152
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-09-04T06:19:20Z
Releases: 14.0
doc: Use tags consistently in the tutorial chapter

Make more consistent use of <screen> and <programlisting>.

Author: Jürgen Purtz <juergen@purtz.de>
Discussion: https://www.postgresql.org/message-id/flat/158996922318.7035.10603922579567326239@wrigleys.postgresql.org

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