doc PG 17 relnotes: add psql connection control-C item

Reported-by: Jelte Fennema-Nio

Discussion: https://postgr.es/m/CAGECzQTz5aUqLEL6daLd2Hu2FXS_LOSh4keDndJ1fwThsb_b5w@mail.gmail.com

Reviewed-by: Tom Lane

Backpatch-through: master

Author: bmomjian

doc/src/sgml/release-17.sgml

@@ -1980,6 +1980,17 @@ The parameter is "min_rows".
 </para>
 </listitem>
 
+<!--
+Author: Robert Haas <rhaas@postgresql.org>
+2024-04-02 [cafe10565] Allow SIGINT to cancel psql database reconnections.
+-->
+
+<listitem>
+<para>
+Allow psql connections to be canceled with control-C (Tristan Partin)
+</para>
+</listitem>
+
 <!--
 Author: Tom Lane <tgl@sss.pgh.pa.us>
 2024-04-06 [90f517821] Re-implement psql's FETCH_COUNT feature atop libpq's chu