Fix misleading generator.close() documentation

The documentation incorrectly stated that generator.close() 'raises' a
GeneratorExit exception. This was misleading because the method doesn't
raise the exception to the caller - it sends the exception internally
to the generator and returns None.

Changed 'raises' to 'sends' in both Doc/reference/expressions.rst and
Doc/howto/functional.rst for consistency and accuracy.

Fixes #135110

Author: cdenihan

Doc/howto/functional.rst

@@ -602,7 +602,7 @@ generators:
   raise an exception inside the generator; the exception is raised by the
   ``yield`` expression where the generator's execution is paused.
 
-* :meth:`~generator.close` raises a :exc:`GeneratorExit` exception inside the
+* :meth:`~generator.close` sends a :exc:`GeneratorExit` exception inside the
   generator to terminate the iteration.  On receiving this exception, the
   generator's code must either raise :exc:`GeneratorExit` or
   :exc:`StopIteration`; catching the exception and doing anything else is

Doc/reference/expressions.rst

@@ -625,8 +625,9 @@ is already executing raises a :exc:`ValueError` exception.
 
 .. method:: generator.close()
 
-   Raises a :exc:`GeneratorExit` at the point where the generator function was
-   paused.  If the generator function catches the exception and returns a
+   Sends a :exc:`GeneratorExit` exception to the generator at the point where 
+   the generator function was paused.  If the generator function catches the 
+   exception and returns a
    value, this value is returned from :meth:`close`.  If the generator function
    is already closed, or raises :exc:`GeneratorExit` (by not catching the
    exception), :meth:`close` returns :const:`None`.  If the generator yields a