Fix typo and XML

doc/kcontrol/splashscreen/index.docbook

@@ -70,10 +70,11 @@ You need to be connected to the Internet to use this action. A dialog will displ
 </screenshot>
 </para>
 <para>
-This new theme is immediately available after you close the System Settings Add-On Installer dialog and is highlighted. The preview displays the picture. You need to click the <guibutton>Apply</guibutton> biutton to make this theme your current splash-screen theme.
+This new theme is immediately available after you close the &systemsettings; Add-On Installer dialog and is highlighted. The preview displays the picture. You need to click the <guibutton>Apply</guibutton> button to make this theme your current splash-screen theme.
 </para>
 </listitem>
 </varlistentry>
+</variablelist>
 
 <!-- not in 5.14
 <varlistentry><term><guilabel>Install Theme File...</guilabel></term>
@@ -99,7 +100,7 @@ This shows you the theme and the associated icons as they will be displayed as s
 </para>
 </listitem>
 </varlistentry>
-</variablelist>
+
 -->
 </article>