Minor bug in example given in `EP - Basic` page

[EvitanRelta]

The below example in EP - Basic should be squareRoot(int s)

[damithc]

@EvitanRelta I was about to change it to int but realized it's meant to be a string that represents a number e.g., "4". Otherwise the first partition s is not a valid number doesn't make sense.

[EvitanRelta]

@damithc Hm then I guess the wording could be improved like:

Pre-conditions: s represents a positive integer as a String

and under the EP:

[ s is not a valid integer in String format ]

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On a side note, I'm thinking [ s is not a valid number ] should be changed to [ s is not a valid integer ] ?

[damithc]

Good point, @EvitanRelta
I've added this to the todo list for the next semester's version of the textbook.