[master] remove unnecessary acronym expansions

bin/delv/delv.docbook

@@ -80,7 +80,7 @@
   <refsection><info><title>DESCRIPTION</title></info>
 
     <para><command>delv</command>
-      (Domain Entity Lookup &amp; Validation) is a tool for sending
+      is a tool for sending
       DNS queries and validating the results, using the same internal
       resolver and validator logic as <command>named</command>.
     </para>

bin/dig/dig.docbook

@@ -89,8 +89,7 @@
 
   <refsection><info><title>DESCRIPTION</title></info>
 
-    <para><command>dig</command>
-      (domain information groper) is a flexible tool
+    <para><command>dig</command> is a flexible tool
       for interrogating DNS name servers.  It performs DNS lookups and
       displays the answers that are returned from the name server(s) that
       were queried.  Most DNS administrators use <command>dig</command> to

doc/arm/Bv9ARM-book.xml

@@ -887,7 +887,7 @@ zone "eng.example.com" {
 	      <term xml:id="dig"><command>dig</command></term>
 	      <listitem>
 		<para>
-		  The domain information groper (<command>dig</command>)
+		  <command>dig</command>
 		  is the most versatile and complete of these lookup tools.
 		  It has two modes: simple interactive
 		  mode for a single query, and batch mode which executes a