Doc: fix missing mention of procedure OUT parameters.

Small oversight in commit 2453ea142.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/3ebc6d295705fec37dc8f57a4ece54b370f55f72

Modified Files
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doc/src/sgml/plpgsql.sgml | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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