wip documentation

docs/sign-up-newsletter.md

@@ -14,7 +14,7 @@ The general information for my form processor looks like this:
 On my form processor I will accept 3 inputs: first name, last name and email.
 The email will be validated (is it a valid email?).
 
-![Form Processor Inputs](/images/newsletter-input-fp.png)
+![Form Processor Inputs](/images/newsletter-inputs-fp.png)
 
 Once the form is sent from the public website I would like the following to happen: