gh-100201: Document behavior with a bare `yield` statement (GH-100416)

(cherry picked from commit 1aab269d4acbf0b29573ad0a21c54fddee233243)

Co-authored-by: ram vikram singh <ramvikrams243@gmail.com>
Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>

diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 0cdf91e75b344469a0610154cefe15a0e66da3af..655d19969a5836695f1e498d0168c92c00a74abc 100644 (file)
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -454,7 +454,9 @@ generator.  That generator then controls the execution of the generator
 function.  The execution starts when one of the generator's methods is called.
 At that time, the execution proceeds to the first yield expression, where it is
 suspended again, returning the value of :token:`~python-grammar:expression_list`
-to the generator's caller.  By suspended, we mean that all local state is
+to the generator's caller,
+or ``None`` if :token:`~python-grammer:expression_list` is omitted.
+By suspended, we mean that all local state is
 retained, including the current bindings of local variables, the instruction
 pointer, the internal evaluation stack, and the state of any exception handling.
 When the execution is resumed by calling one of the generator's methods, the