Update links in reference documentation.

Remove outdated links an make sure to use the springDocsUrl attribute provided via spring-projects/spring-data-build#1895 to resolve links to framework documentation.

Closes: #2490

Author: christophstrobl

src/main/asciidoc/index.adoc

@@ -5,7 +5,7 @@ Costin Leau, Jennifer Hickey, Christoph Strobl, Thomas Darimont, Mark Paluch, Ja
 ifdef::backend-epub3[:front-cover-image: image:epub-cover.png[Front Cover,1050,1600]]
 :spring-data-commons-docs: ../../../../spring-data-commons/src/main/asciidoc
 :spring-framework-javadoc: https://docs.spring.io/spring-framework/docs/{springVersion}/javadoc-api
-:spring-framework-reference: https://docs.spring.io/spring-framework/docs/{springVersion}/reference/html
+:spring-framework-reference: link:{springDocsUrl}
 :store: Redis
 
 (C) 2011-2023 The original authors.

src/main/asciidoc/preface.adoc

@@ -46,7 +46,6 @@ It usually does not take more then five to ten minutes to go through them and, i
 
 One can find various samples for key-value stores in the dedicated Spring Data example repo, at https://github.com/spring-projects/spring-data-keyvalue-examples[https://github.com/spring-projects/spring-data-keyvalue-examples].
 For Spring Data Redis, you should pay particular attention to the `retwisj` sample, a Twitter-clone built on top of Redis that can be run locally or be deployed into the cloud.
-See its https://docs.spring.io/spring-data/data-keyvalue/examples/retwisj/current/[documentation], the following blog https://spring.io/blog/2011/04/27/getting-started-redis-spring-cloud-foundry/[entry] for more information.
 
 [[requirements]]
 == Requirements

src/main/asciidoc/reference/redis.adoc

@@ -12,7 +12,7 @@ Spring Data Redis provides easy configuration and access to Redis from Spring ap
 [[redis:setup]]
 == Getting Started
 
-An easy way to setting up a working environment is to create a Spring-based project in https://spring.io/tools/sts[STS].
+An easy way to setting up a working environment is to create a Spring-based project in https://spring.io/tools/[STS].
 
 First, you need to set up a running Redis server.