refactor: OpenRewrite Recipe best practices

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.recipes.rewrite.OpenRewriteRecipeBestPractices?organizationId=T3BlblJld3JpdGU%3D

Co-authored-by: Moderne <team@moderne.io>

Author: timtebeek

src/test/java/org/openrewrite/rewrite/RecipeTest.java

@@ -16,23 +16,25 @@
 package org.openrewrite.rewrite;
 
 import org.junit.jupiter.api.Test;
+import org.openrewrite.DocumentExample;
 import org.openrewrite.marker.SearchResult;
 import org.openrewrite.test.RecipeSpec;
 import org.openrewrite.test.RewriteTest;
 
 import static org.openrewrite.java.Assertions.java;
 import static org.openrewrite.yaml.Assertions.yaml;
 
-public class RecipeTest implements RewriteTest {
+class RecipeTest implements RewriteTest {
 
     @Override
     public void defaults(RecipeSpec spec) {
         spec.recipe(RewriteTest.toRecipe(() -> new Recipe.Matcher().asVisitor(recipe ->
           SearchResult.found(recipe.getTree(), recipe.getDisplayName() + "=" + recipe.getDescription()))));
     }
 
-    @Test
-    void classDefinedRecipe() {
+  @DocumentExample
+  @Test
+  void classDefinedRecipe() {
         rewriteRun(
           //language=java
           java(