Updated Home (markdown)

Home.md

@@ -2,7 +2,7 @@ This Wiki complements the [Spring Framework reference](https://docs.spring.io/sp
 
 If you're new, please read the [Spring Framework Overview](https://docs.spring.io/spring/docs/current/spring-framework-reference/overview.html#spring-introduction).
 
-If you'd like to contribute, review the guidelines in the project-level [CONTRIBUTING.adoc](https://github.com/SpringSource/spring-framework/blob/master/CONTRIBUTING.adoc).
+If you'd like to contribute, review the guidelines in the project-level [CONTRIBUTING](https://github.com/SpringSource/spring-framework/blob/master/CONTRIBUTING.md) document.
 
 For an opinionated jump-start, check out the [Spring Boot](https://projects.spring.io/spring-boot/) project, use [Spring Initializer](https://start.spring.io/) to create an application, or follow one of the available [guides and tutorials](https://spring.io/guides).