pgsql: Fix ALTER TABLE doc examples.

Fix ALTER TABLE doc examples.

Patch by Yugo Nagata <nagata@sraoss.co.jp>. Confirmed by Amit
Langote, who is the original author of the document part.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/eab86897bd8cbeb21ae8959ca9a095ce7cb663df

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

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