Fix typo in documentation

src/asciidoc/index.adoc

@@ -28791,7 +28791,7 @@ with MVC Java Config>> section describes how the `RequestMappingHandlerMapping`
 be customized.
 
 In the MVC namespace, the `<mvc:annotation-driven>` element has an
-`enableMatrixVariables` attribute that should be set to `true`. By default it is set
+`enable-matrix-variables` attribute that should be set to `true`. By default it is set
 to `false`.
 
 [source,xml,indent=0]
@@ -28807,7 +28807,7 @@ to `false`.
 			http://www.springframework.org/schema/mvc
 			http://www.springframework.org/schema/mvc/spring-mvc.xsd">
 
-		<mvc:annotation-driven enableMatrixVariables="true"/>
+		<mvc:annotation-driven enable-matrix-variables="true"/>
 
 	</beans>
 ----