update class challenges

bad_data.txt

-ERROR_1:  Data with an invalid character.
\ No newline at end of file

data.txt

-This is some good data.
\ No newline at end of file

docs/py_1_1/lab_2.md

@@ -216,4 +216,4 @@ to the console.
     contains the audit report.
 """
 ```
-This series of challenges builds a complete, albeit simple, network configuration auditor.  It covers all the key areas you specified and provides a good "capstone" project for the students.  Let me know if you'd like any modifications or additions!
+

error_data.txt

-ERROR_3: This will cause another type of problem
\ No newline at end of file