[gcab] trivial: Remove a gtk-doc API index that does not exist

[Richard Hughes <rhughes src gnome org>]

commit 76ba230fc055615c2e4c9b378e194cba2536adeb
Author: Richard Hughes <richard hughsie com>
Date:   Thu Dec 14 11:01:37 2017 +0000

    trivial: Remove a gtk-doc API index that does not exist

 docs/reference/gcab-docs.sgml.in |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/docs/reference/gcab-docs.sgml.in b/docs/reference/gcab-docs.sgml.in
index ab15bfd..e983674 100644
--- a/docs/reference/gcab-docs.sgml.in
+++ b/docs/reference/gcab-docs.sgml.in
@@ -39,5 +39,4 @@
   <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>
   <xi:include href="xml/api-index-0.5.xml"><xi:fallback /></xi:include>
   <xi:include href="xml/api-index-0.6.xml"><xi:fallback /></xi:include>
-  <xi:include href="xml/api-index-2.28.xml"><xi:fallback /></xi:include>
 </book>