Fix minor stylistic issue

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/225d9c063820237c979c918cf735bf98cbd566c0

Modified Files
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doc/src/sgml/plperl.sgml |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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	Subject: pgsql: Casts to or from a domain type are ignored; warn and document.