doc: Use tags consistently in the tutorial chapter

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

Author: Jürgen Purtz <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/6eee73e4e5b6d499f1a5529f209ce4af86ef5152

Modified Files
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doc/src/sgml/query.sgml | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

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