Update README.md

* Minor clarification.

Author: gilesgas

README.md

@@ -9,6 +9,6 @@ a web page with the content "Welcome to React" and is accompanied by a test to
 check that the application renders satisfactorily.
 
 The `jenkins` directory contains an example of the `Jenkinsfile` (i.e. Pipeline)
-you'll be creating yourself during the tutorial and the `scripts` directory
+you'll be creating yourself during the tutorial and the `scripts` subdirectory
 contains shell scripts with commands that are executed when Jenkins processes
 the "Deliver" stage of your Pipeline.