Add Missing Doc Header

The EnableMethodSecurity section

docs/modules/ROOT/pages/servlet/authorization/method-security.adoc

@@ -6,6 +6,7 @@ It provides support for JSR-250 annotation security as well as the framework's o
 From 3.0 you can also make use of new xref:servlet/authorization/expression-based.adoc#el-access[expression-based annotations].
 You can apply security to a single bean, using the `intercept-methods` element to decorate the bean declaration, or you can secure multiple beans across the entire service layer using the AspectJ style pointcuts.
 
+[[jc-enable-method-security]]
 == EnableMethodSecurity
 
 In Spring Security 5.6, we can enable annotation-based security using the `@EnableMethodSecurity` annotation on any `@Configuration` instance.