pgsql: doc: Update information_schema documentation for identity column

doc: Update information_schema documentation for identity columns

This was apparently forgotten in the original patch.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/5d8beac8bee344bdf4b05a63b93f06e05d999b39

Modified Files
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doc/src/sgml/information_schema.sgml | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)

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