[vte] docs: Add index for API new in 0.68

[Christian Persch <chpe src gnome org>]

commit 5c067c2a64c411ad5c8cf28e9e5f0f58759a1a08
Author: Christian Persch <chpe src gnome org>
Date:   Sun Aug 29 19:06:46 2021 +0200

    docs: Add index for API new in 0.68

 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 0479d58c..62b779d3 100644
--- a/doc/reference/vte-docs.xml
+++ b/doc/reference/vte-docs.xml
@@ -139,6 +139,10 @@
     <title>Index of new symbols in 0.66</title>
     <xi:include href="xml/api-index-0.66.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-0-68" role="0.68">
+    <title>Index of new symbols in 0.68</title>
+    <xi:include href="xml/api-index-0.68.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"></xi:include>