[gedit] docs: add missing index of new symbols in 3.4

[Sébastien Wilmet <swilmet src gnome org>]

commit ea9f1c203057e1834979165046d6e169dc62fa7c
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Tue Nov 19 07:47:55 2019 +0100

    docs: add missing index of new symbols in 3.4
    
    To fix a gtk-doc warning.

 docs/reference/gedit-docs.xml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/docs/reference/gedit-docs.xml b/docs/reference/gedit-docs.xml
index 37e75b18e..9e32e5469 100644
--- a/docs/reference/gedit-docs.xml
+++ b/docs/reference/gedit-docs.xml
@@ -47,6 +47,10 @@
       <title>Index of deprecated symbols</title>
       <xi:include href="xml/api-index-deprecated.xml"><xi:fallback /></xi:include>
     </index>
+    <index role="3.4">
+      <title>Index of new symbols in 3.4</title>
+      <xi:include href="xml/api-index-3.4.xml"><xi:fallback /></xi:include>
+    </index>
     <index role="3.14">
       <title>Index of new symbols in 3.14</title>
       <xi:include href="xml/api-index-3.14.xml"><xi:fallback /></xi:include>