Improve description of pg_attrdef in documentation

Michael Paquier <michael@paquier.xyz>

Commit: 0993b8ada53395a8c8a59401a7b4cfb501f6aaef
Author: Michael Paquier <michael@paquier.xyz>
Date: 2018-10-29T07:38:54Z
Releases: 12.0
Improve description of pg_attrdef in documentation

The reference to pg_attribute is switched to a link, which is more
useful for the html documentation.  The conditions under which a default
value is defined for a given column are made more general.

Author: Daniel Gustafsson
Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/0E8748E3-8B7D-445E-9ABA-09DA5C7345CC@yesql.se

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doc/src/sgml/catalogs.sgml modified +5 −5

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