Fix links to secondary index configuration in 2.8 release notes

Change-Id: I15cd19510965f3dda4931c46d7a4ce25eba16756
diff --git a/ReleaseNotes/ReleaseNotes-2.8.txt b/ReleaseNotes/ReleaseNotes-2.8.txt
index a92e9d5..5bc2749 100644
--- a/ReleaseNotes/ReleaseNotes-2.8.txt
+++ b/ReleaseNotes/ReleaseNotes-2.8.txt
@@ -35,7 +35,7 @@
 * link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.8/intro-change-screen.html[
 New change screen] with completely redesigned UI and fully using the REST API.
 
-* link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.8/config-gerrit.html#index[
+* link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.8/config-gerrit.html#__a_id_index_a_section_index[
 Secondary indexing with Lucene and Solr].
 
 * Lots of new link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.8/rest-api.html[
@@ -69,7 +69,7 @@
 ~~~~~~~~~~~~~~~~~~~
 
 Gerrit can be configured to use a
-link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.8/config-gerrit.html#index[
+link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.8/config-gerrit.html#__a_id_index_a_section_index[
 secondary index] with Lucene or Solr.
 
 Existing search operations use the secondary index, when enabled, to increase