[3020] Format commands properly

doc/guide/bind10-guide.xml

@@ -2608,10 +2608,11 @@ can use various data source backends.
 
 	<para>
           Initially, a map value has to be set, but this value may be an
-          empty map. After that, key/value pairs can be added with 'config
-          add' and keys can be removed with 'config remove'. The initial
-          value may be an empty map, but it has to be set before zones are
-          added or removed.
+          empty map. After that, key/value pairs can be added with
+          <command>config add</command> and keys can be removed with
+          <command>config remove</command>. The initial value may be an
+          empty map, but it has to be set before zones are added or
+          removed.
 
           <screen>
 &gt; <userinput>config set data_sources/classes/IN[1]/params {}</userinput>