[evince] help: Add comment that page is outdated

[Andre Klapper <aklapper src gnome org>]

commit 8caa66f1c1e4e92d12fbbaeb0feff3791307970b
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Sep 17 03:34:59 2017 +0200

    help: Add comment that page is outdated

 help/C/toolbar.page |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/help/C/toolbar.page b/help/C/toolbar.page
index 6698d4c..5d0f7c8 100644
--- a/help/C/toolbar.page
+++ b/help/C/toolbar.page
@@ -5,6 +5,7 @@
 
   <info>
     <link type="guide" xref="index#tips"/>
+<!-- TODO / FIXME: These links do not validate; page content is outdated -->
     <desc><link xref="toolbar#view">Show, hide</link> or
 <link
 xref="toolbar#edit">edit</link> the toolbar.</desc>