Is there an existing issue for this?

• I have searched the existing issues for a bug report that matches the one I want to file, without success.

Did you read the documentation and troubleshoot guide?

• I have read the documentation and troubleshoot guide

Environment

Sage Version 10.1.beta4

Steps To Reproduce

The defunct IPython magic command %bg is mentioned in the tutorial. It should be removed

Expected Behavior

%bg should not be in the tutorial, since that command doesn't exist, perhaps hasn't existed for 10 years.

Actual Behavior

%bg is advertised.

Additional Information

See https://pypi.org/project/ipython-bg/, but it hasn't been modified for 3 years. See also https://stackoverflow.com/questions/10819479/missing-background-magic-command-bg-in-ipython and ipython/ipython#844.