Only link to the two alternative formats from each format of the reference documentation

spring-boot-project/spring-boot-docs/src/docs/asciidoc/index.adoc

@@ -4,36 +4,35 @@ include::authors.adoc[]
 v{spring-boot-version}
 include::attributes.adoc[]
 
-This document is also available as {spring-boot-docs}/html/[Multi-page HTML], {spring-boot-docs}/htmlsingle/[Single page HTML] and {spring-boot-docs}/pdf/spring-boot-reference.pdf[PDF].
-
+This document is also available as  {spring-boot-docs}/htmlsingle/[a single HTML page] and as {spring-boot-docs}/pdf/spring-boot-reference.pdf[PDF].
 
 The reference documentation consists of the following sections:
 
 [horizontal]
 <<legal#legal,Legal>> :: Legal information.
 <<getting-help#getting-help,Getting Help>> :: Resources for getting help.
 <<documentation#documentation,Documentation Overview>> :: About the Documentation, First Steps, and more.
-<<getting-started#getting-started,Getting Started>> :: Introducing Spring Boot, System Requirements, Servlet Containers, Installing Spring Boot, Developing Your First Spring Boot Application
-<<upgrading#upgrading,Upgrading Spring Boot Applications>> :: Upgrading from 1.x, Upgrading to a new feature release, Upgrading the Spring Boot CLI
+<<getting-started#getting-started,Getting Started>> :: Introducing Spring Boot, System Requirements, Servlet Containers, Installing Spring Boot, and Developing Your First Spring Boot Application
+<<upgrading#upgrading,Upgrading Spring Boot Applications>> :: Upgrading from 1.x, Upgrading to a new feature release, and Upgrading the Spring Boot CLI.
 <<using#using,Using Spring Boot>> :: Build Systems, Structuring Your Code, Configuration, Spring Beans and Dependency Injection, DevTools, and more.
 <<features#features,Core Features>> :: Profiles, Logging, Security, Caching, Spring Integration, Testing, and more.
-<<web#web,Web>> :: Servlet Web, Reactive Web, Embedded Container Support, Graceful Shutdown and more.
+<<web#web,Web>> :: Servlet Web, Reactive Web, Embedded Container Support, Graceful Shutdown, and more.
 <<data#data,Data>> :: SQL and NOSQL data access.
-<<io#io,IO>> :: Caching, Quartz Scheduler, REST clients, Sending email, Spring Web Services and more.
-<<messaging#messaging,Messaging>> :: JMS, AMQP, RSocket, WebSocket, Spring Integration.
-<<container-images#container-images,Container Images>> :: Efficient container images, Building container images with Dockerfiles and Cloud Native Buildpacks.
+<<io#io,IO>> :: Caching, Quartz Scheduler, REST clients, Sending email, Spring Web Services, and more.
+<<messaging#messaging,Messaging>> :: JMS, AMQP, RSocket, WebSocket, and Spring Integration.
+<<container-images#container-images,Container Images>> :: Efficient container images and Building container images with Dockerfiles and Cloud Native Buildpacks.
 <<actuator#actuator,Production-ready Features>> :: Monitoring, Metrics, Auditing, and more.
-<<deployment#deployment,Deploying Spring Boot Applications>> :: Deploying to the Cloud, Installing as a Unix application.
+<<deployment#deployment,Deploying Spring Boot Applications>> :: Deploying to the Cloud, and Installing as a Unix application.
 <<cli#cli,Spring Boot CLI>> :: Installing the CLI, Using the CLI, Configuring the CLI, and more.
 <<build-tool-plugins#build-tool-plugins,Build Tool Plugins>> :: Maven Plugin, Gradle Plugin, Antlib, and more.
 <<howto#howto,"`How-to`" Guides>> :: Application Development, Configuration, Embedded Servers, Data Access, and many more.
 
 The reference documentation has the following appendices:
 
 [horizontal]
-<<application-properties#application-properties,Application Properties>> :: Common application properties that can be used to configure your application.
-<<configuration-metadata#configuration-metadata,Configuration Metadata>> :: Metadata used to describe configuration properties.
+<<application-properties#application-properties,Application Properties>> :: Common application properties that you can use to configure your application.
+<<configuration-metadata#configuration-metadata,Configuration Metadata>> :: Metadata that you can use to describe configuration properties.
 <<auto-configuration-classes#auto-configuration-classes,Auto-configuration Classes>> :: Auto-configuration classes provided by Spring Boot.
-<<test-auto-configuration#test-auto-configuration,Test Auto-configuration Annotations>> :: Test auto-configuration annotations used to test slices of your application.
+<<test-auto-configuration#test-auto-configuration,Test Auto-configuration Annotations>> :: Test auto-configuration annotations that you can use to test slices of your application.
 <<executable-jar#executable-jar,Executable Jars>> :: Spring Boot's executable jars, their launchers, and their format.
 <<dependency-versions#dependency-versions,Dependency Versions>> :: Details of the dependencies that are managed by Spring Boot.

spring-boot-project/spring-boot-docs/src/docs/asciidoc/index.singleadoc

@@ -4,8 +4,12 @@ include::authors.adoc[]
 v{spring-boot-version}
 include::attributes.adoc[]
 
-This document is also available as {spring-boot-docs}/html/[Multi-page HTML], {spring-boot-docs}/htmlsingle/[Single page HTML] and {spring-boot-docs}/pdf/spring-boot-reference.pdf[PDF].
-
+ifdef::backend-html5[]
+This document is also available as {spring-boot-docs}/html/[multiple HTML pages] and as {spring-boot-docs}/pdf/spring-boot-reference.pdf[PDF].
+endif::[]
+ifdef::backend-pdf[]
+This document is also available as {spring-boot-docs}/html/[multiple HTML pages] and as {spring-boot-docs}/htmlsingle/[a single HTML page].
+endif::[]
 
 include::legal.adoc[leveloffset=+1]