Fix neo4j embedded documentation

The neo4j embedded driver no longer embeds the neo4j kernel and users are
expected to add that dependency manually. We don't provide dependency
management for any of them so this commit updates the documentation to
refers to the official documentation.

Closes gh-8567

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -3513,6 +3513,13 @@ persistence for the embedded mode:
 	spring.data.neo4j.uri=file://var/tmp/graph.db
 ----
 
+[NOTE]
+====
+The Neo4j OGM embedded driver does not provide the Neo4j kernel. Users are expected to
+provide this dependency manually, see
+http://neo4j.com/docs/ogm-manual/current/reference/#reference:getting-started[the documentation]
+for more details.
+====
 
 
 [[boot-features-neo4j-ogm-session]]

spring-boot-samples/spring-boot-sample-data-neo4j/README.adoc

@@ -11,13 +11,6 @@ spring.data.neo4j.password=secret
 
 You can also locally add the embedded driver to embed Neo4j instead. Note
 that Spring Boot does not provide dependency management for that GPL-licensed
-library:
-
-```
-<dependency>
-    <groupId>org.neo4j</groupId>
-    <artifactId>neo4j-ogm-embedded-driver</artifactId>
-    <version>${neo4j-ogm.version}</version>
-</dependency>
-```
-
+library, see
+http://docs.spring.io/spring-data/neo4j/docs/4.2.x/reference/html/#reference.getting_started.driver[the official documentation]
+for more details.