doc: PG 16 relnotes, add author

Reported-by: Masahiko Sawada

Discussion: https://postgr.es/m/CAD21AoDP46y+1yUMikYWhCfkhSEuoXmHq2SV8_PyQoM1uWBRbg@mail.gmail.com

Author: bmomjian

doc/src/sgml/release-16.sgml

@@ -156,7 +156,7 @@ Author: Michael Paquier <michael@paquier.xyz>
 
 <listitem>
 <para>
-Remove pg_walinspect functions pg_get_wal_records_info_till_end_of_wal() and pg_get_wal_stats_till_end_of_wal().
+Remove pg_walinspect functions pg_get_wal_records_info_till_end_of_wal() and pg_get_wal_stats_till_end_of_wal() (Bharath Rupireddy)
 </para>
 </listitem>