Update obsolete examples of error messages; various other minor editing.

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

Commit: 6e59122490a3d4f0af0c22e89f949d517b46f5ee
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-09-12T22:17:24Z
Releases: 7.4.1
Update obsolete examples of error messages; various other minor editing.

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