[glib/gio-thumbnail-sizes] Add a 2.76 index to gio docs

[Matthias Clasen <matthiasc src gnome org>]

commit 1e8f3183646516b45e6aa8fbd67315e658b4597e
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 23 08:38:21 2022 -0400

    Add a 2.76 index to gio docs
    
    We added some symbols with Since: 2.76, and
    the doc check complains about the missing index.

 docs/reference/gio/gio-docs.xml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/docs/reference/gio/gio-docs.xml b/docs/reference/gio/gio-docs.xml
index bee46875ff..b3dd9f0c9b 100644
--- a/docs/reference/gio/gio-docs.xml
+++ b/docs/reference/gio/gio-docs.xml
@@ -404,6 +404,10 @@
     <title>Index of new symbols in 2.74</title>
     <xi:include href="xml/api-index-2.74.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-2-76" role="2.76">
+    <title>Index of new symbols in 2.76</title>
+    <xi:include href="xml/api-index-2.76.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>