[3.12] gh-120661: improve example for basic type hints (GH-120934) (#120988)

gh-120661: improve example for basic type hints (GH-120934)
(cherry picked from commit bb057ea)

Co-authored-by: Bénédikt Tran <[email protected]>

Author: miss-islington

Doc/library/typing.rst

@@ -27,12 +27,13 @@ This module provides runtime support for type hints.
 
 Consider the function below::
 
-   def moon_weight(earth_weight: float) -> str:
-       return f'On the moon, you would weigh {earth_weight * 0.166} kilograms.'
+   def surface_area_of_cube(edge_length: float) -> str:
+       return f"The surface area of the cube is {6 * edge_length ** 2}."
 
-The function ``moon_weight`` takes an argument expected to be an instance of :class:`float`,
-as indicated by the *type hint* ``earth_weight: float``. The function is expected to
-return an instance of :class:`str`, as indicated by the ``-> str`` hint.
+The function ``surface_area_of_cube`` takes an argument expected to
+be an instance of :class:`float`, as indicated by the :term:`type hint`
+``edge_length: float``. The function is expected to return an instance
+of :class:`str`, as indicated by the ``-> str`` hint.
 
 While type hints can be simple classes like :class:`float` or :class:`str`,
 they can also be more complex. The :mod:`typing` module provides a vocabulary of