Replace New and Noteworthy with links to release notes.

Closes #1351

Author: schauder

spring-data-r2dbc/src/main/asciidoc/index.adoc

@@ -22,7 +22,7 @@ toc::[]
 
 include::preface.adoc[]
 
-include::new-features.adoc[leveloffset=+1]
+include::{spring-data-commons-docs}/upgrade.adoc[leveloffset=+1]
 
 include::{spring-data-commons-docs}/dependencies.adoc[leveloffset=+1]
 

spring-data-r2dbc/src/main/asciidoc/new-features.adoc

@@ -15,7 +15,7 @@ NOTE: Copies of this document may be made for your own use and for distribution
 include::preface.adoc[]
 
 
-include::new-features.adoc[leveloffset=+1]
+include::{spring-data-commons-docs}/upgrade.adoc[leveloffset=+1]
 include::{spring-data-commons-docs}/dependencies.adoc[leveloffset=+1]
 include::{spring-data-commons-docs}/repositories.adoc[leveloffset=+1]