doc:  clarify when expression indexes evaluate their expressions

Only non-HOT updates evaluate the index expression.

Reported-by: Chris Lowder

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

Backpatch-through: 10

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/e2e1bbde46a3509c3b7e830196f4314242925247

Modified Files
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doc/src/sgml/indices.sgml | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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