doc: clarify handling of range upper/lower/upper_inf/lower_inf()

Clarify handling of infinite range bounds.

Reported-by: [email protected]

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

Co-authored-by: Laurenz Albe

Backpatch-through: 16

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/7539a1b2fc839f45a95f66a42939db13629e79a9

Modified Files
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doc/src/sgml/func.sgml | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)

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