Doc: fix broken markup.

Commit 3d956d956 was apparently not checked against HEAD's doc toolchain.
Per buildfarm.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/eb2a0e00b18aedabd76f5442e38f4bf5d1b94974

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

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