code formatting

worksheets/worksheet5/worksheet5.md

 # Worksheet 5:
 ## Stacks & RPN Calculator
 
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 ```c++
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 class Worksheet{
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 public:
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 Worksheet(int n){
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 	sessionNo = n;
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 }
 
 void whatSession(){
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 	printf("Worksheet %d", sessionNo);
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 }
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 private:
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 	int sessionNo;
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 }; 
 
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 int main(){
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 	Worksheet worksheet(6);
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 	worksheet.whatSession();
 	
 	return 0;
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 }
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 ```