Update course-definition.yml

Co-authored-by: Paul Kuruvilla <rohitpaulk@gmail.com>

Author: andy1li

course-definition.yml

@@ -825,7 +825,7 @@ stages:
       Content-Type: text/plain
       Content-Length: 23
 
-      1F 8B 08 00 00 00 00 00  // This is just showing the response body as hex.
+      1F 8B 08 00 00 00 00 00  // This is the hexadecimal representation of the body.
       00 03 4B 4C 4A 06 00 C2  // It should actually be sent as binary data.
       41 24 35 03 00 00 00
       ```