Doc: explicitly point out that enum values can't be dropped.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 013c0baaddd9df7e1f940184a8ab8e478214b46c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-03-16T17:44:43Z
Releases: 11.0
Doc: explicitly point out that enum values can't be dropped.

This was not stated in so many words anywhere.  Document it to make
clear that it's a design limitation and not just an oversight or
documentation omission.

Discussion: https://postgr.es/m/152089733343.1222.6927268289645380498@wrigleys.postgresql.org

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doc/src/sgml/datatype.sgml modified +14 −6

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