Document r338684, geom(8) '-t' flag addition.

Sponsored by:	The FreeBSD Foundation

en_US.ISO8859-1/htdocs/releases/12.0R/relnotes/relnotes.xml

@@ -628,6 +628,11 @@
 	&man.sysctl.8; to <literal>0</literal>, or adding
 	<literal>vfs.ffs.dotrimcons=0</literal> to
 	&man.sysctl.conf.5;.</para>
+
+      <para revision="338684" contrib="sponsor"
+	sponsor="&darpa_afrl;">The &man.geom.8; utility has been
+	updated to add a new flag, <literal>-t</literal>, which
+	prints the <acronym>GEOM</acronym> hierarchy.</para>
     </sect2>
 
     <sect2 xml:id="storage-net">