docs: switch to using 'id' attribute instead of 'name' for links

The 'name' attribute on <a...> elements is deprecated in favour
of the 'id' attribute which is allowed on any element. HTML5
drops 'name' support entirely.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

docs/formatnode.html.in

@@ -6,7 +6,7 @@
 
     <ul id="toc"></ul>
 
-    <h2><a name="NodedevAttributes">Node Device XML</a></h2>
+    <h2><a id="NodedevAttributes">Node Device XML</a></h2>
 
     <p>
       There are several libvirt functions, all with the
@@ -340,7 +340,7 @@
       </dd>
     </dl>
 
-    <h2><a name="nodeExample">Examples</a></h2>
+    <h2><a id="nodeExample">Examples</a></h2>
 
     <p>The following are some example node device XML outputs:</p>
     <pre>