Doc: update CREATE OPERATOR's statement about => as an operator.

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

Commit: d568d2fab4be8c74804df40b733925ac92dc0dd8
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-10-20T17:01:31Z
Releases: 15.5
Doc: update CREATE OPERATOR's statement about => as an operator.

This doco said that use of => as an operator "is deprecated".
It's been fully disallowed since 865f14a2d back in 9.5, but
evidently that commit missed updating this statement.
Do so now.

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PathChange+/−
doc/src/sgml/ref/create_operator.sgml modified +4 −3

Documentation touched