Adapt documentation BUILD to the reality

* RAT is always running, no such profile RAT anymore.



git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/trunk@1681526 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/BUILD.txt b/BUILD.txt
index d18e56a..562bb7a 100644
--- a/BUILD.txt
+++ b/BUILD.txt
@@ -11,10 +11,8 @@
 
     mvn -Dmaven.test.skip=true install
 
-Normal development, eating dog food:
-
-    mvn clean verify -Prat
-
 Build apache release
 
     mvn clean install -Papache-release
+
+RAT uses the previos release version during the build to verify it complies its own rules.