Add missing article

Noticed while reviewing nearby text

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/abb17ae010261821c3fb6bf5f16b8bc0e870d276

Modified Files
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doc/src/sgml/ddl.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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