Document the -h client flag can use a socket directory as well as a host

Bruce Momjian <bruce@momjian.us>

Commit: 8de72414ea78cf765ccca89c11c4a0fc57e3a6a8
Author: Bruce Momjian <bruce@momjian.us>
Date: 2003-06-11T05:13:12Z
Releases: 7.4.1
Document the -h client flag can use a socket directory as well as a host
name.

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