[iagno] Improve look of help Example page.

[Arnaud B. <arnaudb src gnome org>]

commit 8a1ada69e88a66060d1933d1d675b6cacce86128
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Tue Feb 4 18:37:11 2020 +0100

    Improve look of help Example page.

 help/C/example.page | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/C/example.page b/help/C/example.page
index a67ed1f..7176c78 100644
--- a/help/C/example.page
+++ b/help/C/example.page
@@ -20,7 +20,7 @@
 
   <title>Example game first moves</title>
 
-  <table>
+  <table frame="top" rules="rows">
     <tr>
       <td>
         <media type="image" mime="image/png" src="figures/usual-start.png" width="200" its:translate="no">