Explain the main purpose is to run the GNU stty tests

Author: ChrisDryden

.github/workflows/GnuTests.yml

@@ -120,6 +120,7 @@ jobs:
       ### This shell has been changed from "bash" to this command
       ### "script" will start a pty and the -q command removes the "script" initiation log
       ### the -e flag makes it propogate the error code and -c runs the command in a pty
+      ### the primary purpose of this change is to run the stty GNU tests
       shell: 'script -q -e -c "bash {0}"'
       run: |
         ## Run GNU tests