Update Fork A Repo link (#3142)

Signed-off-by: Tran Ngoc Nhan <[email protected]>

Author: ngocnhan-tran1996

CONTRIBUTING.adoc

@@ -32,7 +32,7 @@ For additional details, please refer to the blog post https://spring.io/blog/202
 
 1. Go to https://github.com/spring-projects/spring-amqp[https://github.com/spring-projects/spring-amqp]
 2. Hit the "fork" button and choose your own github account as the target
-3. For more detail see https://help.github.com/fork-a-repo/[Fork A Repo].
+3. For more detail see https://help.github.com/articles/fork-a-repo/[Fork A Repo].
 
 == Setup your Local Development Environment