Fix obsolete references to old-style contrib installation methods.

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

Commit: f1fb4b0e63a677cdc86de667c75142b88a4edb65
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-02-14T06:10:44Z
Releases: 9.1.0
Fix obsolete references to old-style contrib installation methods.

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