DATACMNS-1362 - Fix broken links to Spring Framework Javadoc.

Author: mp911de

src/main/asciidoc/index.adoc

@@ -23,9 +23,13 @@ include::preface.adoc[]
 
 :leveloffset: +1
 include::dependencies.adoc[]
+
 include::repositories.adoc[]
+
 include::repository-projections.adoc[]
+
 include::query-by-example.adoc[]
+
 include::auditing.adoc[]
 :leveloffset: -1