[3.14] gh-156837: Refer to yield expressions in generator function definitions (GH-156863) (GH-157218)

(cherry picked from commit 2723799)

Co-authored-by: Lucas <lucasefernandes333@gmail.com>

Author: miss-islington

Doc/reference/datamodel.rst

@@ -784,12 +784,12 @@ Generator functions
    single: generator; function
    single: generator; iterator
 
-A function or method which uses the :keyword:`yield` statement (see section
-:ref:`yield`) is called a :dfn:`generator function`.  Such a function, when
+A function or method which contains a :keyword:`yield` expression (see section
+:ref:`yieldexpr`) is called a :dfn:`generator function`.  Such a function, when
 called, always returns an :term:`iterator` object which can be used to
 execute the body of the function:  calling the iterator's
 :meth:`iterator.__next__` method will cause the function to execute until
-it provides a value using the :keyword:`!yield` statement.  When the
+it provides a value using the :keyword:`!yield` expression.  When the
 function executes a :keyword:`return` statement or falls off the end, a
 :exc:`StopIteration` exception is raised and the iterator will have
 reached the end of the set of values to be returned.
@@ -816,7 +816,7 @@ Asynchronous generator functions
    single: asynchronous generator; asynchronous iterator
 
 A function or method which is defined using :keyword:`async def` and
-which uses the :keyword:`yield` statement is called a
+which contains a :keyword:`yield` expression is called a
 :dfn:`asynchronous generator function`.  Such a function, when called,
 returns an :term:`asynchronous iterator` object which can be used in an
 :keyword:`async for` statement to execute the body of the function.