Fix incorrect author name in release notes

Author: Alexander Lakhin
Discussion: https://postgr.es/m/2f55f6d2-3fb0-d4f6-5c47-18da3a1117e0@gmail.com

doc/src/sgml/release-10.sgml

@@ -508,7 +508,7 @@ Branch: REL9_5_STABLE [69a568636] 2018-09-26 10:30:38 +0900
 -->
      <para>
       Fix handling of commit-timestamp tracking during recovery
-      (Masahiko Sawasa, Michael Paquier)
+      (Masahiko Sawada, Michael Paquier)
      </para>
 
      <para>

doc/src/sgml/release-9.5.sgml

@@ -239,7 +239,7 @@
     <listitem>
      <para>
       Fix handling of commit-timestamp tracking during recovery
-      (Masahiko Sawasa, Michael Paquier)
+      (Masahiko Sawada, Michael Paquier)
      </para>
 
      <para>

doc/src/sgml/release-9.6.sgml

@@ -261,7 +261,7 @@
     <listitem>
      <para>
       Fix handling of commit-timestamp tracking during recovery
-      (Masahiko Sawasa, Michael Paquier)
+      (Masahiko Sawada, Michael Paquier)
      </para>
 
      <para>