Apply text suggestions from code review

Co-authored-by: Juliet Shackell <63259011+jshackell-sfdc@users.noreply.github.com>

Author: ad-shreya

messages/devops.work-item.create.md

@@ -20,11 +20,11 @@ Subject (title) of the new work item.
 
 # flags.description.summary
 
-Description of the new work item.
+Description of the new work item; if not specified, the description is blank. 
 
 # examples
 
-- Create a work item with a subject.
+- Create a work item for the project with the specified ID and give the work item the specified subject (title); use the DevOps Center org with alias "my-devops-org": 
 
       <%= config.bin %> <%= command.id %> --target-org my-devops-org --project-id 0Hn000000000001 --subject "Fix login bug"