[orca] Fix 'Extra element link in interleave' validation error

[Andre Klapper <aklapper src gnome org>]

commit f7c1593dcfe3d1dbd46cc21d7fdc1a133b823d11
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Sep 17 14:41:45 2017 +0200

    Fix 'Extra element link in interleave' validation error

 help/C/howto_tables.page |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/howto_tables.page b/help/C/howto_tables.page
index 9e6cbdb..ea9cced 100644
--- a/help/C/howto_tables.page
+++ b/help/C/howto_tables.page
@@ -80,7 +80,7 @@
       <p>
         Depending on where you are, it may be necessary for you to explicitly
         toggle Structural Navigation on before you can use it. To learn more, read
-        <link type="seealso" xref="howto_structural_navigation#toggling_required">
+        <link xref="howto_structural_navigation#toggling_required">
         when toggling Structural Navigation on is required.</link>
       </p>
     </note>