[gtksourceview] docs: add index for 3.20 symbols

[Sébastien Wilmet <swilmet src gnome org>]

commit 7d53190085dc9d9f880fcffa7ec4c7c5cf7697b2
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Oct 11 12:21:12 2015 +0200

    docs: add index for 3.20 symbols

 docs/reference/gtksourceview-docs.xml |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gtksourceview-docs.xml b/docs/reference/gtksourceview-docs.xml
index 8afc0a5..849ac06 100644
--- a/docs/reference/gtksourceview-docs.xml
+++ b/docs/reference/gtksourceview-docs.xml
@@ -154,6 +154,10 @@
     <title>Index of new symbols in 3.18</title>
     <xi:include href="xml/api-index-3.18.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-3-20" role="3.20">
+    <title>Index of new symbols in 3.20</title>
+    <xi:include href="xml/api-index-3.20.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>