[glib/wip/tintou/gio-symbols-index-update] docs: add index of new symbols for gio > 2.52

[Corentin Noël <corentinnoel src gnome org>]

commit c7ac6f3ae0f7d2ea53dfed38f4c08453a9c54150
Author: Corentin Noël <corentin elementary io>
Date:   Tue Nov 13 08:08:14 2018 +0100

    docs: add index of new symbols for gio > 2.52

 docs/reference/gio/gio-docs.xml | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/docs/reference/gio/gio-docs.xml b/docs/reference/gio/gio-docs.xml
index 6abd0ea79..00001becc 100644
--- a/docs/reference/gio/gio-docs.xml
+++ b/docs/reference/gio/gio-docs.xml
@@ -359,6 +359,18 @@
     <title>Index of new symbols in 2.52</title>
     <xi:include href="xml/api-index-2.52.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-2-54" role="2.54">
+    <title>Index of new symbols in 2.54</title>
+    <xi:include href="xml/api-index-2.54.xml"><xi:fallback /></xi:include>
+  </index>
+  <index id="api-index-2-56" role="2.56">
+    <title>Index of new symbols in 2.56</title>
+    <xi:include href="xml/api-index-2.56.xml"><xi:fallback /></xi:include>
+  </index>
+  <index id="api-index-2-58" role="2.58">
+    <title>Index of new symbols in 2.58</title>
+    <xi:include href="xml/api-index-2.58.xml"><xi:fallback /></xi:include>
+  </index>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>