Use @beforeeach instead of @before in JUnit 5 examples

See gh-663

Author: daniel-shuy

docs/src/test/java/com/example/restassured/ExampleApplicationJUnit5Tests.java

@@ -18,7 +18,7 @@
 
 import io.restassured.builder.RequestSpecBuilder;
 import io.restassured.specification.RequestSpecification;
-import org.junit.Before;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.extension.ExtendWith;
 
 import org.springframework.restdocs.RestDocumentationContextProvider;
@@ -33,7 +33,7 @@ public class ExampleApplicationJUnit5Tests {
 	// tag::setup[]
 	private RequestSpecification spec;
 
-	@Before
+	@BeforeEach
 	public void setUp(RestDocumentationContextProvider restDocumentation) {
 		this.spec = new RequestSpecBuilder()
 				.addFilter(documentationConfiguration(restDocumentation)) // <1>