doc:  add SQL query showing handling of NULLs by aggregates

Reported-by: [email protected]

Reviewed-by: Laurenz Albe

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

Backpatch-through: 19

Branch
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REL_19_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/429752e9560f05e2c3dee5646601f1500c1c1611

Modified Files
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doc/src/sgml/syntax.sgml | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)

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