Minor update to contribution guide

Jonathan S. Katz · Jonathan S. Katz · commit c654a820bb6d · 2021-09-15T12:18:32.000-04:00
Using update PR linking term in management software.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -91,7 +91,7 @@ do so at the bottom of the commit message, and make it clearly labeled like so:
 
 ```
 Issue: #123
-Issue: [ch1234]
+Issue: [sc-1234]
 ```
 
 # Submitting Pull Requests
