python/qemu: Replace some remaining "avocados" with "functional tests"

The avocado tests have been replaced by the new functional tests,
so also update this in the README.rst files in the python directory
accordingly.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20251008131936.71160-1-thuth@redhat.com>

python/qemu/machine/README.rst

@@ -2,7 +2,7 @@ qemu.machine package
 ====================
 
 This package provides core utilities used for testing and debugging
-QEMU. It is used by the iotests, vm tests, avocado tests, and several
+QEMU. It is used by the iotests, vm tests, functional tests, and several
 other utilities in the ./scripts directory. It is not a fully-fledged
 SDK and it is subject to change at any time.
 

python/qemu/utils/README.rst

@@ -2,6 +2,6 @@ qemu.utils package
 ==================
 
 This package provides miscellaneous utilities used for testing and
-debugging QEMU. It is used primarily by the vm and avocado tests.
+debugging QEMU. It is used primarily by the vm and functional tests.
 
 See the documentation in ``__init__.py`` for more information.