[master] remove repeated sentence

and regenerate nroff version of manual.

src/bin/host/b10-host.1

@@ -103,10 +103,6 @@ It doesn\'t use
 at this time\&. The default name server used is 127\&.0\&.0\&.1\&.
 .PP
 
-\fBb10\-host\fR
-does not do reverse lookups by default yet (by detecting if name is a IPv4 or IPv6 address)\&.
-.PP
-
 \fB\-p\fR
 is not a standard feature\&.
 .SH "HISTORY"

src/bin/host/b10-host.xml

@@ -176,11 +176,6 @@
     </para>
 
     <para>
-      <command>b10-host</command> does not do reverse lookups by
-      default yet (by detecting if name is a IPv4 or IPv6 address).
-    </para>
-
-    <para>
       <option>-p</option> is not a standard feature.
     </para>
   </refsect1>