docs: remove mention that attnotnull should be changed

Bruce Momjian <bruce@momjian.us>

Commit: 80e6af1272750595c02e910bde907e30c592579b
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-10-11T21:23:57Z
Releases: 9.5.0
docs:  remove mention that attnotnull should be changed

Report by Andres Freund

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doc/src/sgml/catalogs.sgml modified +1 −2