[devhelp] docs: add page IDs

[Sébastien Wilmet <swilmet src gnome org>]

commit f169ea7347c841f225e8e259ed6d23c1aa19f65d
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Jun 16 13:22:01 2017 +0200

    docs: add page IDs
    
    To have more future-proof links, instead of "pt01.html", "pt02.html"
    etc.

 docs/reference/api-breaks.xml   |    2 +-
 docs/reference/devhelp-docs.xml |   10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/docs/reference/api-breaks.xml b/docs/reference/api-breaks.xml
index 62e90e5..2c700dc 100644
--- a/docs/reference/api-breaks.xml
+++ b/docs/reference/api-breaks.xml
@@ -7,7 +7,7 @@
  %gtkdocentities;
 ]>
 
-<part>
+<part id="api-breaks">
   <title>API Breaks</title>
 
   <para>
diff --git a/docs/reference/devhelp-docs.xml b/docs/reference/devhelp-docs.xml
index 8500934..81d8ec4 100644
--- a/docs/reference/devhelp-docs.xml
+++ b/docs/reference/devhelp-docs.xml
@@ -16,29 +16,29 @@
     </releaseinfo>
   </bookinfo>
 
-  <part>
+  <part id="api-reference">
     <title>API Reference</title>
 
-    <chapter>
+    <chapter id="general">
       <title>General</title>
       <xi:include href="xml/init.xml"/>
     </chapter>
 
-    <chapter>
+    <chapter id="data">
       <title>The Data</title>
       <xi:include href="xml/dh-book-manager.xml"/>
       <xi:include href="xml/dh-book.xml"/>
       <xi:include href="xml/dh-link.xml"/>
     </chapter>
 
-    <chapter>
+    <chapter id="side-panel">
       <title>Side Panel</title>
       <xi:include href="xml/dh-sidebar.xml"/>
       <xi:include href="xml/dh-book-tree.xml"/>
       <xi:include href="xml/dh-keyword-model.xml"/>
     </chapter>
 
-    <chapter>
+    <chapter id="assistant">
       <title>Assistant</title>
       <xi:include href="xml/dh-assistant-view.xml"/>
     </chapter>