Fix Typo

Author: 1084565

README.md

@@ -1,6 +1,6 @@
 ## Cloud Foundry Command Line Interface (CLI)
 
-This [_Dockerfiles_](https://docs.docker.com/engine/reference/builder/) can be used in _Continuous Delivery_ (CD) pipelines for SAP development projects. 
+This [_Dockerfile_](https://docs.docker.com/engine/reference/builder/) can be used in _Continuous Delivery_ (CD) pipelines for SAP development projects. 
 The image is optimized for use with project ["Piper"](https://github.com/SAP/jenkins-library) on [Jenkins](https://jenkins.io/).
 Docker containers simplify your CD tool setup, encapsulating tools and environments that are required to execute pipeline steps.