DOC: sync multimaster install instructions between 9.6 and 10

Author: Liudmila Mantrova

doc/src/sgml/multimaster.sgml

@@ -344,34 +344,38 @@
       <para>Suppose
       you are setting up a cluster of three nodes, with
       <literal>node1</literal>, <literal>node2</literal>, and
-      <literal>node3</literal> domain names. First, set up the database to be replicated, and make sure you have a user with superuser rights to perform replication:
+      <literal>node3</literal> domain names. First, set up the database to be replicated, and make sure you have a DBMS user with superuser rights to perform replication:
         </para>
         <itemizedlist>
           <listitem>
             <para>
               If you are starting from scratch, initialize a cluster,
-              create an empty database <literal>mydb</literal> and a new
-              user <literal>myuser</literal>, on each node of the cluster. For details, see <xref linkend="creating-cluster">.
+              create an empty database <literal>mydb</literal> and a new DBMS
+              user <literal>myuser</literal> with superuser rights, on each node of the cluster. For details, see <xref linkend="creating-cluster">.
             </para>
           </listitem>
           <listitem>
             <para>
               If you already have a database <literal>mydb</literal>
-              running on <literal>node1</literal>, initialize
+              running on <literal>node1</literal>, create a new DBMS user
+              <literal>myuser</literal> with superuser rights and initialize
               new nodes from the working node using
-              <application>pg_basebackup</application>. On behalf of <literal>myuser</literal>, run the following command on each node you are going to add:
+              <application>pg_basebackup</application> on behalf of this user.
+              Run the following command on each node you are going to add:
             <programlisting>
-pg_basebackup -D <replaceable>datadir</> -h node1 mydb
+pg_basebackup -D <replaceable>datadir</> -h node1 -U myuser mydb
 </programlisting>
 where <replaceable>datadir</> is the directory containing the database cluster. This directory is specified at the cluster initialization stage, or set in the <envar>PGDATA</envar> environment variable.
+You can also use any other DBMS user with superuser rights instead of <literal>myuser</literal> to perform this task.
 </para>
             <para>
               For details on using <application>pg_basebackup</application>, see
               <xref linkend="app-pgbasebackup">.
             </para>
           </listitem>
         </itemizedlist>
-      <para>Once the database is set up, complete the following steps on each
+      <para>Once the database is set up, complete the following steps on behalf
+      of the <literal>postgres</literal> OS user, on each
       cluster node:
     </para>
     <orderedlist>
@@ -513,16 +517,16 @@ netstat -ln | grep -E '5432|5433'
       </listitem>
       <listitem>
         <para>
-          Restart <productname>PostgreSQL</productname>:
+          On behalf of an OS superuser, restart <productname>&productname;</productname>:
         </para>
         <programlisting>
-pg_ctl -D <replaceable>datadir</replaceable> -l <replaceable>pg.log</replaceable> start
+pg_ctl -D <replaceable>datadir</replaceable> -l <replaceable>pg.log</replaceable> restart
 </programlisting>
       </listitem>
     </orderedlist>
           <para>
           When <productname>&productname;</productname> is started on all nodes, connect to any node
-          and create the <filename>multimaster</filename> extension:
+          on behalf of the <literal>postgres</literal> OS user and create the <filename>multimaster</filename> extension:
           <programlisting>
 psql -h node1
 CREATE EXTENSION multimaster;</programlisting></para>