[kstars] doc: Add missing reference

[Jasem Mutlaq]

Git commit f8e1086ac4920776d5a41ffa6e28b8db4a8cb480 by Jasem Mutlaq.
Committed on 24/05/2018 at 18:58.
Pushed by mutlaqja into branch 'master'.

Add missing reference

M  +1    -0    doc/hips.docbook
M  +2    -1    doc/index.docbook

https://commits.kde.org/kstars/f8e1086ac4920776d5a41ffa6e28b8db4a8cb480

diff --git a/doc/hips.docbook b/doc/hips.docbook
index a020f6abd..2c609f95b 100644
--- a/doc/hips.docbook
+++ b/doc/hips.docbook
@@ -1,6 +1,7 @@
 <sect1 id="hips">
 <title><acronym>HiPS</acronym> Progressive Overlay</title>
 <indexterm><primary>Views</primary>
+<secondary>HiPS Progressive Overlay</secondary>
 </indexterm>
 
 <para>&kstars; provides support for HiPS: Hierarchical Progressive Surveys. HiPS provides multi-resolution progressive surveys to be overlayed directly in client applications.
diff --git a/doc/index.docbook b/doc/index.docbook
index 2b4e698e7..e3337f2a3 100644
--- a/doc/index.docbook
+++ b/doc/index.docbook
@@ -65,6 +65,7 @@
   <!ENTITY tools SYSTEM "tools.docbook">
   <!ENTITY utime SYSTEM "utime.docbook">
   <!ENTITY zenith SYSTEM "zenith.docbook">
+  <!ENTITY hips SYSTEM "hips.docbook">
   <!ENTITY % addindex "INCLUDE">
   <!ENTITY % English "INCLUDE"><!-- change language only here -->
 ]>
@@ -225,7 +226,7 @@ includes &DBus; functions that allow you to <link linkend="tool-scriptbuilder">w
 astronomical topics. Furthermore, any 3rd party tool or language with support of &DBus; can be used to write powerful scripts using <ulink url="http://api.kde.org/4.x-api/kdeedu-apidocs/kstars/html/classkstars.html">&kstars; &DBus; API</ulink>
 </para>
 <para>
-Enable <link linked="hips">HiPS</link> all-sky progressive overlay to fetch high-resolution images and display them directly in the sky map. You can select from numerous catalogs compiled from different earth and space based missions.
+Enable <link linkend="hips">HiPS all-sky progressive overlay</link> to fetch high-resolution images and display them directly in the sky map. You can select from numerous catalogs compiled from different earth and space based missions.
 This features requires a fast interenet connection in order to download the images. The image are cached locally to reduce bandwidth. You can optimize the caching options to best balance between disk space versus bandwidth.
 </para>
 <para>