Update contrib documention mentions to point to actual documentation

Bruce Momjian <bruce@momjian.us>

Commit: 159e3d86292cfec2a2828f9f69ac7a6cb1be242d
Author: Bruce Momjian <bruce@momjian.us>
Date: 2011-01-26T14:22:21Z
Releases: 9.1.0
Update contrib documention mentions to point to actual documentation
sections, rather than just calling it "/contrib/module_name".

Also update pg_test_fsync build instructions now that it is in /contrib.

Files