fixes a type in the end-to-end pipeline tutorial

content/doc/tutorials/build-a-multibranch-pipeline-project.adoc

@@ -273,8 +273,7 @@ and test stages run successfully with output",width=100%]
 === Add deliver and deploy stages to your Pipeline
 
 Next, add "Deliver for development" and "Deploy for production" stages to your
-Pipeline, which Jenkins will selectively execute based on the based on the
-branch that Jenkins is building from.
+Pipeline, which Jenkins will selectively execute based on the branch that Jenkins is building from.
 
 This takes the "Pipeline-as-Code" concept to a new level, in which a single
 `Jenkinsfile` describes your project's entire build, test, delivery and