Fix typo in error message.

Per Euler Taveira de Oliveira.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/99155aaa33f417daabd38c8b225c09a3c6da71ba

Modified Files
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src/backend/commands/collationcmds.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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