Doc: remove long-obsolete advice about generated constraint names.

It's been twenty years since we generated constraint names that
look like "$N".  So this advice about double-quoting such names
is well past its sell-by date, and now it merely seems confusing.

Reported-by: Yaroslav Saburov <y.sabu...@gmail.com>
Author: "David G. Johnston" <david.g.johns...@gmail.com>
Discussion: 
https://postgr.es/m/174393459040.678.17810152410419444...@wrigleys.postgresql.org
Backpatch-through: 13

Branch
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REL_17_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/03faf38a13e51f708b1abf030aa33ad42731d027

Modified Files
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doc/src/sgml/ddl.sgml | 3 ---
1 file changed, 3 deletions(-)

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