Add underscore for dunder methods. (#4920)

src/data/roadmaps/python/content/102-python-advanced-topics/100-oop/100-methods-dunder.md

@@ -5,7 +5,7 @@ A method in python is somewhat similar to a function, except it is associated wi
 - The method is implicitly used for an object for which it is called.
 - The method is accessible to data that is contained within the class.
 
-Dunder or magic methods in Python are the methods having two prefix and suffix underscores in the method name. Dunder here means “Double Under (Underscores)”. These are commonly used for operator overloading. Few examples for magic methods are: **init**, **add**, **len**, **repr** etc.
+Dunder or magic methods in Python are the methods having two prefix and suffix underscores in the method name. Dunder here means “Double Under (Underscores)”. These are commonly used for operator overloading. Few examples for magic methods are: **`__init__`**, **`__add__`**, **`__len__`**, **`__repr__`** etc.
 
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