Fix typo in person's name.

Back-patch v16..v12 (all supported versions); master is unaffected.

Author: nmisch

doc/src/sgml/release-16.sgml

@@ -5436,7 +5436,7 @@ Author: Andres Freund <andres@anarazel.de>
     <member>Mehmet Emin Karakas</member>
     <member>Melanie Plageman</member>
     <member>Melih Mutlu</member>
-    <member>Micah Gate</member>
+    <member>Micah Gates</member>
     <member>Michael Banck</member>
     <member>Michael Paquier</member>
     <member>Michail Nikolaev</member>