docstring::ClassMethodDocInject

ClassMethodDocInject is a decorator that can be used to inject docstrings into a class method. It takes a string argument that will be used as the docstring for the decorated method.

Example usage:

class MyClass:
    @ClassMethodDocInject("This method does something.")
    def my_method(cls, arg1, arg2):
        # method implementation goes here

In the example above, the `my_method` class method of `MyClass` is decorated with `ClassMethodDocInject`. The docstring for the method is specified as an argument to the decorator.

Note that the `cls` parameter is used to indicate that this is a class method, and not an instance method.