Fixing includes

Author: ryanjbaxter

README.adoc

@@ -38,8 +38,7 @@ and binding to the Spring Environment and other Spring programming model idioms.
 
 == Building
 
-
-:jdkversion: 17
+:jdkversion: 1.8
 
 === Basic Compile and Test
 

docs/src/main/asciidoc/README.adoc

@@ -12,11 +12,11 @@ include::intro.adoc[]
 
 == Building
 
-include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/main/docs/src/main/asciidoc/building-jdk8.adoc[]
+include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/3.1.x/docs/src/main/asciidoc/building-jdk8.adoc[]
 
 == Contributing
 
-include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/main/docs/src/main/asciidoc/contributing.adoc[]
+include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/3.1.x/docs/src/main/asciidoc/contributing.adoc[]
 
 == License