Properly document rotatelogs, and add mention of it to pg_ctl manual page.

doc/src/sgml/maintenance.sgml

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 <chapter id="maintenance">
@@ -461,7 +461,7 @@ VACUUM
    you can send a <literal>SIGHUP</literal> signal to the
    <application>syslog</> daemon whenever you want to force it to
    start writing a new log file.  If you want to automate log
-   rotation, the <application>logrotate</application> program can be
+   rotation, the <application>rotatelogs</application> program can be
    configured to work with log files from
    <application>syslog</application>.
   </para>
@@ -484,12 +484,12 @@ VACUUM
    pipe command:
 
 <programlisting>
-pg_ctl start | logrotate
+pg_ctl start | rotatelogs /var/log/pgsql_log 86400
 </programlisting>
 
    The <productname>PostgreSQL</> distribution doesn't include a
    suitable log rotation program, but there are many available on the
-   Internet. For example, the <application>logrotate</application>
+   Internet. For example, the <application>rotatelogs</application>
    tool included in the <productname>Apache</productname> distribution
    can be used with <productname>PostgreSQL</productname>.
   </para>

doc/src/sgml/ref/pg_ctl-ref.sgml

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 PostgreSQL documentation
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@@ -87,13 +87,13 @@ PostgreSQL documentation
    server is started in the background, and standard input is attached to
    <filename>/dev/null</filename>.  The standard output and standard
    error are either appended to a log file (if the <option>-l</option>
-   option is used), or redirected to  <application>pg_ctl</application>'s 
+   option is used), or redirected to <application>pg_ctl</application>'s 
    standard output (not standard error).  If no log file is chosen, the 
    standard output of <application>pg_ctl</application> should be redirected 
-   to a file or piped to another process, for example a log rotating program,
-   otherwise <command>postmaster</command> will write its output to the controlling
-   terminal (from the background) and will not leave the shell's
-   process group.
+   to a file or piped to another process such as a log rotating program
+   like <application>rotatelogs</>; otherwise the <command>postmaster</command> 
+   will write its output to the controlling terminal (from the background) 
+   and will not leave the shell's process group.
   </para>
 
   <para>