Data Types and Conditionals: Edit a Knowledge check question

[youssef-el-atmani]

Removed a questions about a deprecated String Method: substr()

Because

Because the substr() method is deprecated: String.prototype.substr()

This PR

-Remove a word from a knowledge question that is related to a deprecated String method

Issue

Closes #XXXXX

Additional Information

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[wise-king-sullyman]

Seems like a good change, thanks!