refactor: Change type of Example to DocumentExample

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.java.ChangeType?organizationId=ODQ2MGExMTUtNDg0My00N2EwLTgzMGMtNGE1NGExMTBmZDkw#defaults%3DW3sibmFtZSI6Im9sZEZ1bGx5UXVhbGlmaWVkVHlwZU5hbWUiLCJ2YWx1ZSI6Im9yZy5vcGVucmV3cml0ZS5FeGFtcGxlIn0seyJuYW1lIjoibmV3RnVsbHlRdWFsaWZpZWRUeXBlTmFtZSIsInZhbHVlIjoib3JnLm9wZW5yZXdyaXRlLkRvY3VtZW50RXhhbXBsZSJ9XQ%3D%3D

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

Author: timtebeek

src/test/java/org/openrewrite/java/migrate/lang/UseVarKeywordTest.java

@@ -18,7 +18,7 @@
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
-import org.openrewrite.Example;
+import org.openrewrite.DocumentExample;
 import org.openrewrite.config.Environment;
 import org.openrewrite.test.RecipeSpec;
 import org.openrewrite.test.RewriteTest;
@@ -381,7 +381,7 @@ void m() {
         @Nested
         class Applicable {
             @Test
-            @Example
+            @DocumentExample
             void forString() {
                 //language=java
                 rewriteRun(
@@ -761,7 +761,7 @@ void m() {
             }
 
             @Test
-            @Example
+            @DocumentExample
             void withDiamondOperator() {
                 //language=java
                 rewriteRun(

src/test/java/org/openrewrite/java/migrate/lang/var/UseVarForGenericsConstructorsTest.java

@@ -17,7 +17,7 @@
 
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
-import org.openrewrite.Example;
+import org.openrewrite.DocumentExample;
 import org.openrewrite.Issue;
 import org.openrewrite.test.RecipeSpec;
 import org.openrewrite.test.RewriteTest;
@@ -420,7 +420,7 @@ void twoParams() {
         }
 
         @Test
-        @Example
+        @DocumentExample
         void withTypeParameterInDefinitionOnly() {
             //language=java
             rewriteRun(