Fix build failure (II)

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -1804,8 +1804,7 @@ Spring decides not to handle it. Most of the time this will not happen (unless y
 the default MVC configuration) because Spring will always be able to handle requests
 through the `DispatcherServlet`.
 
-
-By default, resources are mapped on `/**` but you can tune that via
+By default, resources are mapped on `+/**+` but you can tune that via
 `spring.mvc.static-path-pattern`. For instance, relocating all resources to `/resources/**`
 can be achieved as follows: