Fix typo in MultiQubitSystemMeasurements.ipynb

[delight1019]

Hello!

I fixed a typo in MultiQubitSystemMeasurements.ipynb.

[tcNickolas]

Thank you!

[tcNickolas]

I just realized that the workbook for task 7 has the same issue, since task descriptions are duplicated in both notebooks. Can you do the same fix there as part of this pull request? (This is your 4th one so you shouldn't need a separate one for Hacktoberfest :-))

[delight1019]

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[delight1019]

I just realized that the workbook for task 7 has the same issue, since task descriptions are duplicated in both notebooks. Can you do the same fix there as part of this pull request? (This is your 4th one so you shouldn't need a separate one for Hacktoberfest :-))

Oops, I missed the workbook :( Thank you!!

[tcNickolas]

Thank you!