Refine Querydsl documentation.

See #4894

src/main/antora/modules/ROOT/pages/repositories/core-extensions.adoc

@@ -22,7 +22,7 @@ It provides the following features:
 * Adapts better to refactoring changes in domain types.
 * Incremental query definition is easier.
 
-See the http://www.querydsl.com/static/querydsl/latest/reference/html/[QueryDSL documentation] for how to bootstrap your environment for APT-based code generation using Maven or Ant.
+See the http://www.querydsl.com/static/querydsl/latest/reference/html/[Querydsl documentation] for how to bootstrap your environment for APT-based code generation using Maven or Ant.
 
 QueryDSL lets you write queries such as the following:
 
@@ -160,6 +160,11 @@ Maven::
 [source,xml,indent=0,subs="verbatim,quotes",role="primary"]
 ----
 <dependencies>
+    <dependency>
+        <groupId>org.springframework.data</groupId>
+        <artifactId>spring-data-mongodb</artifactId>
+    </dependency>
+
     <dependency>
         <groupId>com.querydsl</groupId>
         <artifactId>querydsl-mongodb</artifactId>