Indent testing subsections in nav.adoc

docs/modules/ROOT/nav.adoc

@@ -73,8 +73,8 @@
 *** xref:servlet/kotlin-configuration/index.adoc[Kotlin Configuration]
 *** xref:servlet/namespace/index.adoc[Namespace Configuration]
 ** xref:servlet/test/index.adoc[Testing]
-** xref:servlet/test/method.adoc[Method Security]
-** xref:servlet/test/mockmvc.adoc[MockMvc Support]
+*** xref:servlet/test/method.adoc[Method Security]
+*** xref:servlet/test/mockmvc.adoc[MockMvc Support]
 ** xref:servlet/crypto/index.adoc[Cryptography]
 ** xref:servlet/appendix/index.adoc[Appendix]
 *** xref:servlet/appendix/database-schema.adoc[Database Schemas]