[devhelp] docs: create Annexes part

[Sébastien Wilmet <swilmet src gnome org>]

commit f614ca65a1c806a00c615264fe5046ac0235968f
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Jun 16 13:24:47 2017 +0200

    docs: create Annexes part
    
    Like in GtkSourceView. That way it takes less vertical space in the book
    tree (when all parts are folded).

 docs/reference/devhelp-docs.xml |   38 +++++++++++++++++++++-----------------
 1 files changed, 21 insertions(+), 17 deletions(-)
---
diff --git a/docs/reference/devhelp-docs.xml b/docs/reference/devhelp-docs.xml
index 81d8ec4..1532bb0 100644
--- a/docs/reference/devhelp-docs.xml
+++ b/docs/reference/devhelp-docs.xml
@@ -46,23 +46,27 @@
 
   <xi:include href="api-breaks.xml"/>
 
-  <chapter id="object-tree">
-    <title>Object Hierarchy</title>
-    <xi:include href="xml/tree_index.sgml"/>
-  </chapter>
+  <part id="annexes">
+    <title>Annexes</title>
 
-  <index id="api-index-full">
-    <title>API Index</title>
-    <xi:include href="xml/api-index-full.xml"><xi:fallback /></xi:include>
-  </index>
-  <index id="deprecated-api-index" role="deprecated">
-    <title>Index of deprecated API</title>
-    <xi:include href="xml/api-index-deprecated.xml"><xi:fallback /></xi:include>
-  </index>
-  <index id="api-index-3-26" role="3.26">
-    <title>Index of new symbols in 3.26</title>
-    <xi:include href="xml/api-index-3.26.xml"><xi:fallback /></xi:include>
-  </index>
+    <chapter id="object-tree">
+      <title>Object Hierarchy</title>
+      <xi:include href="xml/tree_index.sgml"/>
+    </chapter>
+
+    <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>
 
-  <xi:include href="xml/annotation-glossary.xml"><xi:fallback /></xi:include>
+    <index id="api-index-full">
+      <title>API Index</title>
+      <xi:include href="xml/api-index-full.xml"><xi:fallback /></xi:include>
+    </index>
+    <index id="deprecated-api-index" role="deprecated">
+      <title>Index of deprecated API</title>
+      <xi:include href="xml/api-index-deprecated.xml"><xi:fallback /></xi:include>
+    </index>
+    <index id="api-index-3-26" role="3.26">
+      <title>Index of new symbols in 3.26</title>
+      <xi:include href="xml/api-index-3.26.xml"><xi:fallback /></xi:include>
+    </index>
+  </part>
 </book>