Doc: tweak examples to silence line-too-long PDF build warnings.

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

Commit: 3d14c174cbbb6f83d8ac63fa7d0e1f42e0ae8d30
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-05-14T22:13:08Z
Releases: 13.0
Doc: tweak examples to silence line-too-long PDF build warnings.

In one or two places it seemed reasonable to modify the example so as
to shorten its output slightly; but for the most part I just added a
&zwsp; after 67 characters, which is the most we can fit on a line
of monospace text in A4 format.

Discussion: https://postgr.es/m/6916.1589146280@sss.pgh.pa.us

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