[gxml.wiki] Update examples with a table of contents

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit f42c25b0150283dac4eb7266c27ef611cdffc300
Author: Daniel Espinosa Ortiz <esodan gmail com>
Date:   Mon Mar 8 23:24:21 2021 +0000

    Update examples with a table of contents

 examples.md | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/examples.md b/examples.md
index ba0e820..1f1ae5f 100644
--- a/examples.md
+++ b/examples.md
@@ -1,3 +1,5 @@
+`[[_TOC_]]`
+
 # Access XML documents using DOM4
 
 GXml allows to read XML documents and access all nodes using [DOM4 
API](https://gnome.pages.gitlab.gnome.org/gxml/dev/GXml.DomDocument.html).