Fix link in doc to Spring Test

Closes gh-8226

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

@@ -4979,7 +4979,7 @@ If you use the
 the following provided libraries:
 
 * http://junit.org[JUnit] -- The de-facto standard for unit testing Java applications.
-* {spring-reference}/#integration-testing.html[Spring Test] & Spring Boot Test --
+* {spring-reference}/#integration-testing[Spring Test] & Spring Boot Test --
   Utilities and integration test support for Spring Boot applications.
 * http://joel-costigliola.github.io/assertj/[AssertJ] -- A fluent assertion library.
 * http://hamcrest.org/JavaHamcrest/[Hamcrest] -- A library of matcher objects (also known