docs: minor updates. (#4344)

-gpexpand - Add link to AdminGuide, Expanding a Greenplum System
-pljava_vmoptions - change set classification to reload from restart

gpdb-doc/dita/ref_guide/config_params/guc-list.xml

@@ -6496,7 +6496,7 @@
       <p>Controls which message levels are written to the server log. Each level includes all the
         levels that follow it. The later the level, the fewer messages are sent to the log.</p>
       <p>If the Greenplum Database PL/Container extension is installed. This parameter also controls
-        the PL/Container log level. For information about the extension, see  <xref
+        the PL/Container log level. For information about the extension, see <xref
           href="../extensions/pl_container.xml"/>.</p>
       <table id="log_min_messages_table">
         <tgroup cols="3">
@@ -8212,7 +8212,7 @@
             <row>
               <entry colname="col1">string</entry>
               <entry colname="col2"/>
-              <entry colname="col3">master<p>system</p><p>restart</p><p>superuser</p></entry>
+              <entry colname="col3">master<p>system</p><p>reload</p><p>superuser</p></entry>
             </row>
           </tbody>
         </tgroup>

gpdb-doc/dita/utility_guide/admin_utilities/gpexpand.xml

@@ -28,14 +28,16 @@
         <li id="kt137989">You are logged in as the Greenplum Database superuser
             (<codeph>gpadmin</codeph>).</li>
         <li id="kt136978">The new segment hosts have been installed and configured as per the
-          existing segment hosts. This involves:<ul id="ul_att_m1q_n4"><li id="kt138636">Configuring
-              the hardware and OS</li><li id="kt138640">Installing the Greenplum software</li><li id="kt138641">Creating the
-                <codeph>gpadmin</codeph> user account</li><li id="kt138642">Exchanging SSH keys.
-            </li></ul></li>
+          existing segment hosts. This involves:<ul id="ul_att_m1q_n4">
+            <li id="kt138636">Configuring the hardware and OS</li>
+            <li id="kt138640">Installing the Greenplum software</li>
+            <li id="kt138641">Creating the <codeph>gpadmin</codeph> user account</li>
+            <li id="kt138642">Exchanging SSH keys. </li>
+          </ul></li>
         <li id="kt137052">Enough disk space on your segment hosts to temporarily hold a copy of your
           largest table. </li>
-        <li>When redistributing data, Greenplum Database must be running in production
-          mode. Greenplum Database cannot be restricted mode or in master mode. The
+        <li>When redistributing data, Greenplum Database must be running in production mode.
+          Greenplum Database cannot be restricted mode or in master mode. The
             <codeph>gpstart</codeph> options <codeph>-R</codeph> or <codeph>-m</codeph> cannot be
           specified to start Greenplum Database. </li>
       </ul>
@@ -61,9 +63,8 @@
             RANDOMLY</codeph>. The original distribution policies are later restored in the
           redistribution phase.</li>
       </ul>
-      <note>Data redistribution should
-          be performed during low-use hours. Redistribution can divided into batches over an
-          extended period.</note>
+      <note>Data redistribution should be performed during low-use hours. Redistribution can divided
+        into batches over an extended period.</note>
       <p>To begin the redistribution phase, you must run <codeph>gpexpand</codeph> with either the
           <codeph>-d</codeph> (duration) or <codeph>-e</codeph> (end time) options. Until the
         specified end time or duration is reached, the utility will redistribute tables in the
@@ -71,13 +72,12 @@
         rebalance the tables across new segments, and to set tables to their original distribution
         policy. If <codeph>gpexpand</codeph> completes the reorganization of all tables before the
         specified duration, it displays a success message and ends.</p>
-      <note>This utility uses secure shell (SSH) connections between systems to
-         perform its tasks. In large Greenplum Database deployments, cloud deployments,
-         or deployments with a large number of segments per host, this utility may
-         exceed the host's maximum threshold for unauthenticated connections.
-         Consider updating the SSH <codeph>MaxStartups</codeph> configuration parameter
-         to increase this threshold. For more information about SSH configuration
-         options, refer to the SSH documentation for your Linux distribution.</note>
+      <note>This utility uses secure shell (SSH) connections between systems to perform its tasks.
+        In large Greenplum Database deployments, cloud deployments, or deployments with a large
+        number of segments per host, this utility may exceed the host's maximum threshold for
+        unauthenticated connections. Consider updating the SSH <codeph>MaxStartups</codeph>
+        configuration parameter to increase this threshold. For more information about SSH
+        configuration options, refer to the SSH documentation for your Linux distribution.</note>
     </section>
     <section id="section5">
       <title>Options</title>
@@ -205,10 +205,10 @@
     <section id="section7">
       <title>See Also</title>
       <p>
-        <codeph>
-          <xref href="gpssh-exkeys.xml#topic1"/>
-        </codeph>
-      </p>
+        <codeph><xref href="gpssh-exkeys.xml#topic1"/></codeph>, <xref
+          href="../../admin_guide/expand/expand-main.xml" scope="peer">Expanding a Greenplum System</xref>
+        <ph otherprops="op-print">in the <cite>Greenplum Database Administrator
+        Guide</cite></ph></p>
     </section>
   </body>
 </topic>