Document custom DispatcherServlet requirement

Closes gh-14145

spring-boot-project/spring-boot-docs/src/main/asciidoc/howto.adoc

@@ -1308,12 +1308,22 @@ source for more details.
 
 [[howto-switch-off-the-spring-mvc-dispatcherservlet]]
 === Switch Off the Spring MVC DispatcherServlet
-Spring Boot wants to serve all content from the root of your application (`/`) down. If
-you would rather map your own servlet to that URL, you can do it. However, you may lose
-some of the other Boot MVC features. To add your own servlet and map it to the root
-resource, declare a `@Bean` of type `Servlet` and give it the special bean name,
-`dispatcherServlet`. (You can also create a bean of a different type with that name if
-you want to switch it off and not replace it.)
+By default, All content is served from the root of your application (`/`) down. If you
+would rather map to a different path, you can configure one as follows:
+
+[source,properties,indent=0,subs="verbatim"]
+----
+	server.servlet.path=/acme
+----
+
+If you have additional servlets you can declare a  `@Bean` of type `Servlet` or
+`ServletRegistrationBean` for each and Spring Boot will register them transparently to the
+container. Because servlets are registered that way, they can be mapped to a sub-context
+of the `DispatcherServlet` without invoking it.
+
+Configuring the `DispatcherServlet` yourself is unusual but if you really need to do it, a
+`@Bean` of type `DispatcherServletPath` must be provided as well to provide the path of
+your custom `DispatcherServlet`.