Fix broken link to Spring Data Envers

As of version 3.0, this project has been merged into Spring Data JPA.

spring-boot-project/spring-boot-docs/build.gradle

@@ -307,7 +307,6 @@ tasks.withType(org.asciidoctor.gradle.jvm.AbstractAsciidoctorTask) {
 					"spring-boot-version": project.version,
 					"spring-data-commons-version": versionConstraints["org.springframework.data:spring-data-commons"],
 					"spring-data-couchbase-version": versionConstraints["org.springframework.data:spring-data-couchbase"],
-					"spring-data-envers-version": versionConstraints["org.springframework.data:spring-data-envers"],
 					"spring-data-jdbc-version": versionConstraints["org.springframework.data:spring-data-jdbc"],
 					"spring-data-jpa-version": versionConstraints["org.springframework.data:spring-data-jpa"],
 					"spring-data-mongodb-version": versionConstraints["org.springframework.data:spring-data-mongodb"],

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

@@ -65,7 +65,6 @@
 :spring-data-elasticsearch: https://spring.io/projects/spring-data-elasticsearch
 :spring-data-elasticsearch-docs: https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/
 :spring-data-envers: https://spring.io/projects/spring-data-envers
-:spring-data-envers-doc: https://docs.spring.io/spring-data/envers/docs/{spring-data-envers-version}/reference/html/
 :spring-data-gemfire: https://spring.io/projects/spring-data-gemfire
 :spring-data-geode: https://spring.io/projects/spring-data-geode
 :spring-data-jpa: https://spring.io/projects/spring-data-jpa

spring-boot-project/spring-boot-docs/src/docs/asciidoc/data/sql.adoc

@@ -249,7 +249,7 @@ To use Spring Data Envers, make sure your repository extends from `RevisionRepos
 
 include::code:CountryRepository[]
 
-NOTE: For more details, check the {spring-data-envers-doc}[Spring Data Envers reference documentation].
+NOTE: For more details, check the {spring-data-jpa-docs}/#envers[Spring Data Envers reference documentation].