[gnome-builder] doc: add refptr back to SDK docs

[Christian Hergert <chergert src gnome org>]

commit efa6ebc85a0fe125bef93cd2b00997822ae312a9
Author: Christian Hergert <chergert redhat com>
Date:   Mon Nov 6 13:28:28 2017 -0800

    doc: add refptr back to SDK docs
    
    Now that this is properly installed, we should have it here.

 doc/sdk/libide-docs.sgml |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/doc/sdk/libide-docs.sgml b/doc/sdk/libide-docs.sgml
index 6a466ac..c355629 100644
--- a/doc/sdk/libide-docs.sgml
+++ b/doc/sdk/libide-docs.sgml
@@ -439,6 +439,7 @@
       <xi:include href="xml/ide-posix.xml"/>
       <xi:include href="xml/ide-enums.xml"/>
       <xi:include href="xml/ide-progress.xml"/>
+      <xi:include href="xml/ide-ref-ptr.xml"/>
       <xi:include href="xml/ide-settings.xml"/>
     </chapter>
     <chapter>