pgsql: doc: Correct ALTER USER MAPPING example

doc: Correct ALTER USER MAPPING example

The existing example threw an error.

From: gabrielle <gorthx@gmail.com>

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/4bac555ea260d2cc046e4e9f01ac61ad5bba1fdb

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

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