man: mention that 'status' is the default command for hostnamectl

Author: yuwata

man/hostnamectl.xml

@@ -121,16 +121,19 @@
       <xi:include href="standard-options.xml" xpointer="help" />
       <xi:include href="standard-options.xml" xpointer="version" />
     </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Commands</title>
 
     <para>The following commands are understood:</para>
 
     <variablelist>
       <varlistentry>
         <term><command>status</command></term>
 
-        <listitem><para>Show current system
-        hostname and related
-        information.</para></listitem>
+        <listitem><para>Show current system hostname and related information. If no command is specified,
+        this is the implied default.</para></listitem>
       </varlistentry>
 
       <varlistentry>