[vte] docs: Add index for API new in 0.58

[Christian Persch <chpe src gnome org>]

commit 4717fd5d9e0faf34786f642f3a8fbf260ab0cbb7
Author: Christian Persch <chpe src gnome org>
Date:   Thu Apr 25 23:53:16 2019 +0200

    docs: Add index for API new in 0.58

 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 6d0205c7..61a390e2 100644
--- a/doc/reference/vte-docs.xml
+++ b/doc/reference/vte-docs.xml
@@ -118,6 +118,10 @@
     <title>Index of new symbols in 0.56</title>
     <xi:include href="xml/api-index-0.56.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-0-58" role="0.58">
+    <title>Index of new symbols in 0.58</title>
+    <xi:include href="xml/api-index-0.58.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>