doc: mention use of cross platform logical replication

Discussion: https://postgr.es/m/CAJrrPGfdknoqZcMipPy8XnH3hO3uRic6JTD=jv35oj1DWqL07g@mail.gmail.com

Author: Haribabu Kommi

doc/src/sgml/logical-replication.sgml

@@ -64,6 +64,13 @@
     </para>
    </listitem>
 
+   <listitem>
+    <para>
+     Replicating between cross platform PostgreSQL instances (for example
+     Linux to Windows)
+    </para>
+   </listitem>
+   
    <listitem>
     <para>
      Giving access to replicated data to different groups of users.