pgsql: doc: Small wording change for clarity

doc: Small wording change for clarity

From: Martín Marqués <martin@2ndquadrant.com>

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/122b99478a7baa3a8deb03938ea5ae15a1ad7584

Modified Files
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doc/src/sgml/plpgsql.sgml | 2 +-
doc/src/sgml/ref/create_function.sgml | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

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