docs(object_to_json): fix small grammar/format issues

subjects/devops/object_to_json/README.md

@@ -8,7 +8,7 @@ You just landed a new job, congrats! Your new task is to build two functions to
 
 The new registration information comes as string formatted as JSON. You need to create a file `object_to_json.py` that will have the following functions inside:
 
-1. `create_new_user` that will receive a `dict` and will return a new object of the class `User` provided below. To be valid, the input `dict` must have a `username` key and a `email` key . The new `User` will have the same `username` and `email` of the input `dict`. If the input `dict` is invalid, the default user will be returned.
+1. `create_new_user` that will receive a `dict` and will return a new object of the class `User` provided below. To be valid, the input `dict` must have a `username` key and an `email` key. The new `User` will have the same `username` and `email` of the input `dict`. If the input `dict` is invalid, the default user will be returned.
 
 ```python
 class User:
@@ -38,7 +38,7 @@ print(user_to_json(user_1))
 ```console
 $ python3 test.py
 {"username": "mario", "email": "mario@me.it"}
-    {}
+{}
 $
 ```