Typo in robot-simulator test.

[JKilgallen]

Sorry if opening an issue for this is unnecessary (this is my first time ever opening one).

I noticed a couple of typos in the robot-simulator test suite.
In line 102 of robot-simulator-test.lisp it reads
advance-decrements-y-when-facing-north
when I believe it should be (based on the test)
advance-decrements-y-when-facing-south
Additionally, line 126 reads
move-east-and-north-readme
when I think it should just be
move-east-and-north
in line with the rest of the tests.

Would anyone mind if I made the changes and did a pull request? (my first on an open-source project)

[github-actions]

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[verdammelt]

@JKilgallen Thanks for catching these.

Do you want to submit a PR?