[glib] docs: Add 2.56 to the API version reference in glib-docs.xml

[Philip Withnall <pwithnall src gnome org>]

commit f33ca578b1343e2970eb45d10edfcc0f47e91bb8
Author: Philip Withnall <withnall endlessm com>
Date:   Tue Nov 7 13:26:44 2017 +0000

    docs: Add 2.56 to the API version reference in glib-docs.xml
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=790015

 docs/reference/glib/glib-docs.xml |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/glib/glib-docs.xml b/docs/reference/glib/glib-docs.xml
index 93639b1..a0716c1 100644
--- a/docs/reference/glib/glib-docs.xml
+++ b/docs/reference/glib/glib-docs.xml
@@ -252,6 +252,10 @@
     <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>
 
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>