doc:  show how interval's 3 unit buckets behave using EXTRACT()

This clarifies when justify_days() and justify_hours() are useful.
Paragraph moved too.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.3

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/b6e94b820a21146b898232bc3e3920b31198e637

Modified Files
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doc/src/sgml/datatype.sgml | 40 +++++++++++++++++++++++++++-------------
1 file changed, 27 insertions(+), 13 deletions(-)

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