Doc: fix description of UNION/CASE/etc type unification.

The description of what select_common_type() does was not terribly
accurate.  Improve it.

David Johnston and Tom Lane

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

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/8216a1d3ed27364c7b2a9e6db76f15202a6070c1

Modified Files
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doc/src/sgml/typeconv.sgml | 33 +++++++++++++++++++--------------
1 file changed, 19 insertions(+), 14 deletions(-)

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