Polish "Update docs and internal dep mgmt following Spock 2.0's release"

See gh-26586

Author: wilkinsona

spring-boot-project/spring-boot-docs/src/docs/asciidoc/features/testing.adoc

@@ -870,13 +870,11 @@ Alternatively, you can specify a source for your test, which disables the behavi
 
 [[features.testing.spring-boot-applications.spock]]
 ==== Using Spock to Test Spring Boot Applications
-If you wish to use Spock to test a Spring Boot application, you should add a dependency on Spock's `spock-spring` module to your application's build.
+Spock 2.x can be used to test a Spring Boot application.
+To do so, add a dependency on Spock's `spock-spring` module to your application's build.
 `spock-spring` integrates Spring's test framework into Spock.
 See https://spockframework.org/spock/docs/2.0/modules.html#_spring_module[the documentation for Spock's Spring module] for further details.
 
-NOTE: As of Spring Boot 2.5.x and its support for Groovy 3.x you have two options to make use of Spock:
-Either use the latest Spock 2.x release that is compatible with Groovy 3.x or stick with Spock 1.3 and downgrade Spring Boot's Groovy version to 2.5.x.
-
 
 
 [[features.testing.utilities]]