[vte] docs: Add index for 0.52 API additions

[Christian Persch <chpe src gnome org>]

commit a3fd7cfc0c05e64a36c9e28c9001ac4fc048f11e
Author: Christian Persch <chpe src gnome org>
Date:   Wed Sep 13 21:16:37 2017 +0200

    docs: Add index for 0.52 API additions

 doc/reference/vte-docs.xml |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/doc/reference/vte-docs.xml b/doc/reference/vte-docs.xml
index 9e66f2b..f9ed578 100644
--- a/doc/reference/vte-docs.xml
+++ b/doc/reference/vte-docs.xml
@@ -106,6 +106,10 @@
     <title>Index of new symbols in 0.50</title>
     <xi:include href="xml/api-index-0.50.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-0-52" role="0.52">
+    <title>Index of new symbols in 0.52</title>
+    <xi:include href="xml/api-index-0.52.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>