Polish

Closes gh-16494

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

@@ -8021,7 +8021,7 @@ by the test slice.
 [source,java,indent=0]
 ----
 	@Component
-	public class TestWebMvcConfigurer extends WebMvcConfigurer {
+	public class TestWebMvcConfigurer implements WebMvcConfigurer {
 		...
 	}
 ----

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/reactive/webclient/WebFluxTestAutoConfigurationIntegrationTests.java

@@ -66,7 +66,7 @@ public class WebFluxTestAutoConfigurationIntegrationTests {
 	}
 
 	@Test
-	public void freemarkerAutoConfigurationIsImported() {
+	public void freeMarkerAutoConfigurationIsImported() {
 		assertThat(this.applicationContext)
 				.has(importedAutoConfiguration(FreeMarkerAutoConfiguration.class));
 	}