fix(say): remove misleading comment

[ahans]

I think a student could be very confused by this comment when we expect them to throw in case of an error. This comment is verbatim copy from the problem specification. At the very least, it should be reworded to make clear that we expect an exception, but I think it's best removed.

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[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

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[ahans]

[no important files changed]

[ahans]

@vaeng What do you think?

[vaeng]

Yes, that is not necessary with our implementation