[3803] Addressed review comments

Minor changes to admin text.

doc/guide/admin.xml

@@ -54,8 +54,8 @@
     <para>
       To manage the databases, Kea provides the
       <command>kea-admin</command> tool. It is able to initialize
-      a new database, check its version number, and perform a
-      database upgrade.
+      a new database, check its version number, perform a
+      database upgrade, and dump lease data to a text file.
     </para>
 
     <para>
@@ -96,7 +96,8 @@
             <command>lease-dump</command> &mdash;
             Dumps the contents of the lease database (for MySQL or PostgreSQL
             backends) to CSV text file. The first line of the file contains
-            the column names.
+            the column names.  This is meant to be used as a diagnostic
+            tool that provides a portable, human-readable form of lease data.
           </simpara>
         </listitem>
       </itemizedlist>