[devhelp] docs: add index of new symbols in 3.26

[Sébastien Wilmet <swilmet src gnome org>]

commit f56a28c44650908a5f7edc843649b993f87830d1
Author: Sébastien Wilmet <sebastien wilmet uclouvain be>
Date:   Wed May 3 19:41:44 2017 +0200

    docs: add index of new symbols in 3.26

 docs/reference/devhelp-docs.xml |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/devhelp-docs.xml b/docs/reference/devhelp-docs.xml
index 5a7dade..fb4ee09 100644
--- a/docs/reference/devhelp-docs.xml
+++ b/docs/reference/devhelp-docs.xml
@@ -32,6 +32,7 @@
     <title>Object Hierarchy</title>
     <xi:include href="xml/tree_index.sgml"/>
   </chapter>
+
   <index id="api-index-full">
     <title>API Index</title>
     <xi:include href="xml/api-index-full.xml"><xi:fallback /></xi:include>
@@ -40,6 +41,10 @@
     <title>Index of deprecated API</title>
     <xi:include href="xml/api-index-deprecated.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-3-26" role="3.26">
+    <title>Index of new symbols in 3.26</title>
+    <xi:include href="xml/api-index-3.26.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>
 </book>