[gedit] docs: do not have duplicated IDs

[Sébastien Wilmet <swilmet src gnome org>]

commit c7026304b0261fec389f26b2a381facb7217ec3e
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Tue Nov 19 07:12:21 2019 +0100

    docs: do not have duplicated IDs
    
    The included files contain the same ID.

 docs/reference/gedit-docs.xml | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/docs/reference/gedit-docs.xml b/docs/reference/gedit-docs.xml
index dd44439fd..c73726dd7 100644
--- a/docs/reference/gedit-docs.xml
+++ b/docs/reference/gedit-docs.xml
@@ -29,22 +29,22 @@
 
   <xi:include href="api-breaks.xml"/>
 
-  <chapter id="object-tree">
+  <chapter>
     <title>Object Hierarchy</title>
      <xi:include href="xml/tree_index.sgml"/>
   </chapter>
 
-  <index id="api-index-full">
+  <index>
     <title>Index of all symbols</title>
     <xi:include href="xml/api-index-full.xml"><xi:fallback /></xi:include>
   </index>
 
-  <index id="api-index-deprecated" role="deprecated">
+  <index role="deprecated">
     <title>Index of deprecated symbols</title>
     <xi:include href="xml/api-index-deprecated.xml"><xi:fallback /></xi:include>
   </index>
 
-  <index id="api-index-3-14" role="3.14">
+  <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>
   </index>