[gxml.wiki] Update examples fix table of contents

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit de8ddad1636cf73ced9e39ff34f8a629f80618ef
Author: Daniel Espinosa Ortiz <esodan gmail com>
Date:   Mon Mar 8 23:27:46 2021 +0000

    Update examples fix table of contents

 examples.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/examples.md b/examples.md
index 1f1ae5f..89211fb 100644
--- a/examples.md
+++ b/examples.md
@@ -1,4 +1,6 @@
-`[[_TOC_]]`
+Examples on how use GXml DOM4 and serialization of GObject classes.
+
+[[_TOC_]]
 
 # Access XML documents using DOM4