doc: update wording of ineffective SET and ABORT commands

Bruce Momjian <bruce@momjian.us>

Commit: 54916b99f7e97aa6e32a4f265527f7517539d802
Author: Bruce Momjian <bruce@momjian.us>
Date: 2013-12-02T17:51:58Z
Releases: 9.4.0
doc:  update wording of ineffective SET and ABORT commands

Wording by Alvaro Herrera

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