[docs] Print Command

[Camil Kassar]

IN Topic 2 and Topic 3, (maybe later topics) print commands are missing parenthesis, for example:
>>> i = 256*256
>>> print 'The value of i is', i
The value of i is 65536Should be>>> i = 256*256
>>> print ('The value of i is', i)
The value of i is 65536 		 	   		  
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