pgsql: docs: remove mention that attnotnull should be changed

docs: remove mention that attnotnull should be changed

Report by Andres Freund

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/80e6af1272750595c02e910bde907e30c592579b

Modified Files
--------------
doc/src/sgml/catalogs.sgml | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

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