doc: Improve indentation of SQL examples

Some of these were indented using 8 spaces whereas the rest uses 4
spaces.  Probably originally some difference in tab size.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/a56e26784d7f418015a5be471eb500614a2f24ee

Modified Files
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doc/src/sgml/queries.sgml | 72 +++++++++++++++++++++++------------------------
1 file changed, 36 insertions(+), 36 deletions(-)

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