PATCH: document for regression test forgets libpq test

[Ryo Matsumura (Fujitsu)]

Hi,

I found a small mistake in document in 33.1.3. Additional Test Suites.

> The additional tests that can be invoked this way include:
The list doesn't include interface/libpq/test.

I attached patch.

Thank you.

Best Regards
Ryo Matsumura
Fujitsu Limited

regress_doc_fix.diff
Description: regress_doc_fix.diff