Docs - change from libedit to readline

gpdb-doc/dita/install_guide/platform-requirements.xml

@@ -68,7 +68,6 @@
             <li>curl</li>
             <li>krb5</li>
             <li>libcurl</li>
-            <li>libedit</li>
             <li>libevent</li>
             <li>libxml2</li>
             <li>libyaml</li>
@@ -78,6 +77,7 @@
             <li>openssl</li>
             <li>openssl-libs (RHEL7/Centos7)</li>
             <li>perl</li>
+            <li>readline</li>
             <li>rsync</li>
             <li>R</li>
             <li>sed (used by <codeph>gpinitsystem</codeph>)</li>
@@ -102,7 +102,6 @@
             <li>krb5-multidev </li>
             <li>libcurl3-gnutls </li>
             <li>libcurl4 </li>
-            <li>libedit2 </li>
             <li>libevent-2.1-6 </li>
             <li>libxml2 </li>
             <li>libyaml-0-2 </li>
@@ -112,6 +111,7 @@
             <li>openssh-client </li>
             <li>openssl </li>
             <li>perl </li>
+            <li>readline</li>
             <li>rsync</li>
             <li>sed </li>
             <li>tar </li>

gpdb-doc/dita/utility_guide/ref/psql.xml

@@ -1609,7 +1609,7 @@ testdb=> INSERT INTO my_table VALUES (:'content');</codeblock>
       </sectiondiv>
       <sectiondiv id="section16">
         <b>Command-Line Editing</b>
-        <p><codeph>psql</codeph> supports the NetBSD libedit library for convenient line editing and
+        <p><codeph>psql</codeph> uses the <codeph>readline</codeph> library for convenient line editing and
           retrieval. The command history is automatically saved when <codeph>psql</codeph> exits and
           is reloaded when <codeph>psql</codeph> starts up. Tab-completion is also supported,
           although the completion logic makes no claim to be an SQL parser. The queries generated by