[vte] docs: Add index for API new in 0.56

[Christian Persch <chpe src gnome org>]

commit 35d867918c497df7a15aeb731a88937e28cf899d
Author: Christian Persch <chpe src gnome org>
Date:   Thu Apr 25 23:53:16 2019 +0200

    docs: Add index for API new in 0.56

 doc/reference/vte-docs.xml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/doc/reference/vte-docs.xml b/doc/reference/vte-docs.xml
index 4803b761..6d0205c7 100644
--- a/doc/reference/vte-docs.xml
+++ b/doc/reference/vte-docs.xml
@@ -114,6 +114,10 @@
     <title>Index of new symbols in 0.54</title>
     <xi:include href="xml/api-index-0.54.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-0-56" role="0.56">
+    <title>Index of new symbols in 0.56</title>
+    <xi:include href="xml/api-index-0.56.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>