doc: mention libpq regression tests

Reported-by: Ryo Matsumura
Discussion: https://postgr.es/m/TYCPR01MB11316B3FB56EE54D70BF0CEF6E8E4A@TYCPR01MB11316.jpnprd01.prod.outlook.com

Backpatch-through: 11

diff --git a/doc/src/sgml/regress.sgml b/doc/src/sgml/regress.sgml
index 415fdb8f31d03b22a48452b1c6453e2c9e7d2038..5448f8035d142bf88bac665c4889c86f5aa6634b 100644 (file)
--- a/doc/src/sgml/regress.sgml
+++ b/doc/src/sgml/regress.sgml
@@ -194,8 +194,9 @@ make check-world -j8 >/dev/null
    </listitem>
    <listitem>
     <para>
-     Regression tests for the ECPG interface library,
-     located in <filename>src/interfaces/ecpg/test</filename>.
+     Regression tests for the interface libraries,
+     located in <filename>src/interfaces/libpq/test</filename> and
+     <filename>src/interfaces/ecpg/test</filename>.
     </para>
    </listitem>
    <listitem>