Merge pull request #1321 from OWASP/update-challenge8

Update challenge8.adoc

src/main/resources/explanations/challenge8.adoc

@@ -1,6 +1,8 @@
 === Generating random values
 
-Now, let's randomize the secret at startup... Can you find the answer?
+Sometimes, we need to have a secret that is randomly generated at startup. Maybe you have encountered them already: applications that generate a password for first login and print that to standard out. One example is https://www.jenkins.io/doc/book/installing/linux/#unlocking-jenkins[Jenkins].
+
+In this challenge, we will do the same thing: we randomly generate a secret at the startup of the application and log it to standard out. Can you find the answer?
 How can we use this on the next startup ;-)?
 
 Tip: take a look at the logging of the application at startup!