Mention the default pg_ctl wait time in the -t option documentation

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

@@ -314,7 +314,7 @@ PostgreSQL documentation
       <listitem>
        <para>
         The number of seconds to wait when waiting for start or shutdown
-        to complete.
+        to complete.  The default is 60 seconds.
        </para>
       </listitem>
      </varlistentry>
@@ -324,7 +324,8 @@ PostgreSQL documentation
       <listitem>
        <para>
         Wait for the start or shutdown to complete.  The default wait time
-        is 60 seconds.  This is the default option for shutdowns. A successful 
+        is 60 seconds but can be overridden with the option <option>-t</option>.
+        To wait is the default option for shutdowns. A successful
         shutdown is indicated by removal of the <acronym>PID</acronym> 
         file. For starting up, a successful <command>psql -l</command> 
         indicates success. <command>pg_ctl</command> will attempt to