Uses 4.0.x for docs

docs/src/main/asciidoc/README.adoc

@@ -12,6 +12,6 @@ You can read more about Spring Cloud Contract by going to https://spring.io/proj
 
 == 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/4.0.x/docs/src/main/asciidoc/contributing.adoc[]
 
 include::_building.adoc[]

docs/src/main/asciidoc/_attributes.adoc

@@ -29,7 +29,7 @@
 :standalone_messaging_samples_path: {samples_path}/standalone/dsl
 :standalone_restdocs_path: {samples_path}/standalone/restdocs
 :tests_path: {core_path}/tests
-:samples_branch: main
+:samples_branch: 4.0.x
 :samples_url: https://raw.githubusercontent.com/spring-cloud-samples/spring-cloud-contract-samples/{samples_branch}
 :samples_code: https://github.com/spring-cloud-samples/spring-cloud-contract-samples/tree/{samples_branch}
 :doc_samples: {samples_code}/wiremock-for-contract-docs

spring-cloud-contract-tools/spring-cloud-contract-maven-plugin/src/site/asciidoc/junit.adoc

@@ -1,4 +1,4 @@
-:branch: main
+:branch: 4.0.x
 
 == Java Project with JUnit Tests
 

spring-cloud-contract-tools/spring-cloud-contract-maven-plugin/src/site/asciidoc/spock.adoc

@@ -1,4 +1,4 @@
-:branch: main
+:branch: 4.0.x
 
 == Groovy Project with Spock Specifications