OOP Revisions

Added a bit of explanation around initialization and instantiation.
Mentioned what a wrapper function is.
Revised possible typo(s).
Clarified oop_init.py comments.

programs/oop_init.py

@@ -7,5 +7,6 @@ class Person:
 
 p = Person('Swaroop')
 p.say_hi()
-# The previous 2 lines can also be written as
+# We can get the same output by
+# rewriting the previous 2 lines as
 # Person('Swaroop').say_hi()