change workflow type

Author: angelazhou32

exercises/hello-workflow/README.md

@@ -75,7 +75,7 @@ If you have time, continue with the optional part of the exercise below to see h
 The mix of single and double quotes we currently have pertains to UNIX-style shells. However, If you are running the Temporal CLI in Windows (such as Powershell), you will need to use Windows-style quote escaping like this:
 
 ```
-temporal workflow start --type GreetSomeone --task-queue greeting-tasks --workflow-id my-first-workflow --input '\"Mason\"'
+temporal workflow start --type HelloWorkflowWorkflow --task-queue greeting-tasks --workflow-id my-first-workflow --input '\"Mason\"'
 ```
 
 This is a general Windows approach for handling quotes in parameters, not something specific to Temporal.