Add reference to libpq environment variables for client applications.

Bruce Momjian <bruce@momjian.us>

Commit: ecd70d75267ccf845e8f3976048d944e4ee35cf7
Author: Bruce Momjian <bruce@momjian.us>
Date: 2005-05-29T03:32:18Z
Releases: 8.1.0
Add reference to libpq environment variables for client applications.

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