- duh. add missing listentry stop markers

docs/buildroot.html

@@ -177,10 +177,10 @@
     <p>Buildroot optionally honors some environment variables that are passed
     to <code>make</code> :</p>
     <ul>
-    <li>HOSTCXX
-    <li>HOSTCC
-    <li>UCLIBC_CONFIG_FILE=&lt;path/to/.config&gt;
-    <li>BUSYBOX_CONFIG_FILE=&lt;path/to/.config&gt;
+    <li>HOSTCXX</li>
+    <li>HOSTCC</li>
+    <li>UCLIBC_CONFIG_FILE=&lt;path/to/.config&gt;</li>
+    <li>BUSYBOX_CONFIG_FILE=&lt;path/to/.config&gt;</li>
     </ul>
 
     <p>An example that uses config files located in the toplevel directory and