Sure here is the updated Python function with the docstring attached:

```python
def is_palindrome(string: str) -> bool:
    """
    This is a function that returns a boolean if the string is a palendrome.
    A palendrome is a string that remains unchanged when spelled backwards
    
    :param string: the string that is checked for a palindrome
    :returns: a boolean that is True or False if the string is palindrome or not
    """
    return string == string[::-1]
```
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