Fixing spelling mistake

Author: ChrisDryden

.github/workflows/GnuTests.yml

@@ -119,7 +119,7 @@ jobs:
     - name: Run GNU tests
       ### 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 -e flag makes it propagate 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: |